{"id":12884,"date":"2026-09-04T06:30:00","date_gmt":"2026-09-04T04:30:00","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/?p=12884"},"modified":"2026-09-24T23:33:38","modified_gmt":"2026-09-24T21:33:38","slug":"customer-match-60-or-540-days-of-membership-depending-on-the-method","status":"publish","type":"post","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/digital-marketing\/customer-match-60-or-540-days-of-membership-depending-on-the-method\/","title":{"rendered":"Customer Match: 60 or 540 Days of Membership, Depending on the Method"},"content":{"rendered":"<p>A trade publication reported in August 2026 that the newer matching method inside Customer Match carries a maximum membership duration of sixty days, against five hundred and forty for the established list. Whether those exact figures hold is a question for the documentation. What they illustrate is worth knowing regardless, because membership duration is the least understood setting in audience management.<\/p>\n\n<p>It looks like a retention policy. It behaves like a multiplier.<\/p>\n\n<figure class=\"lw-diagram\">\n<img decoding=\"async\" src=\"https:\/\/www.lukaswojcik.com\/blog\/wp-content\/uploads\/diagrams\/zwei-fristen-en.png\" width=\"1120\" height=\"580\" loading=\"lazy\" alt=\"Two horizontal spans on a shared axis compressed after day ninety, a short sixty-day span above a long five-hundred-and-forty-day one, beside a panel computing the resulting steady-state list sizes\">\n<figcaption>Same inflow, two durations. The ratio between the resulting lists is the ratio between the durations, and nothing else.<\/figcaption>\n<\/figure>\n\n<h2>Why duration sets the size<\/h2>\n<p>Consider a list that gains a thousand new members a day and loses members only when their duration expires. On day one it holds a thousand. On day sixty it holds sixty thousand. On day sixty-one the first thousand drop out while a new thousand join, and from then on the list stays at sixty thousand.<\/p>\n\n\n<figure style=\"--cbb-digits:2\" class=\"cbb cbb--wrap cbb--numbers wp-block-code-beautifier-block-code\" data-lang=\"plain\"><figcaption class=\"cbb-head\"><span class=\"cbb-lang\">Text<\/span><span class=\"cbb-actions\"><button type=\"button\" class=\"cbb-button cbb-button--wrap\" data-cbb-action=\"wrap\" aria-pressed=\"true\" title=\"Wrap long lines\"><svg aria-hidden=\"true\" focusable=\"false\" width=\"16\" height=\"16\" viewBox=\"0 0 16 16\"><path d=\"M2 4h12M2 8h9.5a2.5 2.5 0 0 1 0 5H8m0 0 1.5-1.5M8 13l1.5 1.5M2 12h3\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><span class=\"cbb-sr\">Wrap long lines<\/span><\/button><button type=\"button\" class=\"cbb-button cbb-button--copy\" data-cbb-action=\"copy\" data-cbb-done=\"Copied\" data-cbb-failed=\"Press Ctrl+C to copy\"><svg aria-hidden=\"true\" focusable=\"false\" width=\"16\" height=\"16\" viewBox=\"0 0 16 16\"><rect x=\"5.5\" y=\"5.5\" width=\"8\" height=\"8.5\" rx=\"1.5\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"\/><path d=\"M10.5 3.5V3A1.5 1.5 0 0 0 9 1.5H4A1.5 1.5 0 0 0 2.5 3v6.5A1.5 1.5 0 0 0 4 11h.5\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\"\/><\/svg><span class=\"cbb-button-label\" aria-live=\"polite\">Copy<\/span><\/button><\/span><\/figcaption><pre class=\"cbb-pre\" tabindex=\"0\"><code class=\"cbb-code language-plain\" style=\"counter-reset:cbb-line 0;\"><span class=\"cbb-line\">steady state       size = daily inflow x membership duration\n<\/span><span class=\"cbb-line\">\n<\/span><span class=\"cbb-line\">  1,000\/day x  60 days  =   60,000\n<\/span><span class=\"cbb-line\">  1,000\/day x 540 days  =  540,000\n<\/span><span class=\"cbb-line\">\n<\/span><span class=\"cbb-line\">  ratio 9 : 1, and the inflow cancels out entirely\n<\/span><span class=\"cbb-line\">\n<\/span><span class=\"cbb-line\">what it is not     a data retention setting. Expiry removes\n<\/span><span class=\"cbb-line\">                   someone from the audience, it does not\n<\/span><span class=\"cbb-line\">                   delete the underlying customer record\n<\/span><span class=\"cbb-line\">\n<\/span><span class=\"cbb-line\">what breaks it     members who are re-added. A list fed by\n<\/span><span class=\"cbb-line\">                   repeat purchases converges lower than the\n<\/span><span class=\"cbb-line\">                   formula suggests, because each re-add\n<\/span><span class=\"cbb-line\">                   restarts one clock instead of starting two<\/span><\/code><\/pre><\/figure>\n\n\n<p>The inflow cancelling out is the part worth carrying away. The ratio between two lists with different durations does not depend on how big the business is. It is the ratio of the durations, whether the list gains ten members a day or ten thousand.<\/p>\n\n<h2>The floor that a shrinking list runs into<\/h2>\n<p>Audience lists have a minimum size below which they stop being served. That threshold does not move when a duration setting changes, which produces the failure that actually costs money: a list that worked at five hundred and forty days sits comfortably above the floor, and the same list at sixty days does not.<\/p>\n<p>Nothing about this announces itself as a configuration problem. The campaign simply stops delivering, the audience shows as too small, and the cause is a setting somebody changed weeks earlier for a good reason.<\/p>\n<p>The check is arithmetic and takes a minute: divide the current list size by the current duration to get the effective daily inflow, then multiply by the proposed duration. If the answer is near the floor, the shorter duration is not available at the current volume, whatever its other merits.<\/p>\n\n<h2>What the shorter duration is actually for<\/h2>\n<p>Given all that, a sixty-day cap sounds like a downgrade. It is better understood as a different trade.<\/p>\n<p>Everyone on a sixty-day list interacted within the last two months. Consent, if consent is the basis, was given recently rather than eighteen months ago. Contact details are recent enough to still match. And the list cannot contain someone who has been receiving the same remarketing for a year and a half, which is a real outcome on a five-hundred-and-forty-day list and rarely an intended one.<\/p>\n<p>Matching described as working without third-party cookies belongs in the same picture: shorter, fresher, first-party. The size is the price of that, and for a large enough audience it is a price worth paying.<\/p>\n\n<h2>Before changing the setting<\/h2>\n<p>Two figures make the decision straightforward. The first is the current list size divided by the current duration, which gives the daily inflow the list actually has rather than the one anyone assumes. The second is the serving floor for the audience type in question.<\/p>\n<p>With those two numbers the answer falls out without an experiment, and the experiment is expensive: an audience that drops below the floor takes a full duration cycle to grow back, and during that time the campaign attached to it is not running.<\/p>\n\n<div class=\"lw-faq\">\n<h2>Questions and answers<\/h2>\n\n<h3>Why does a list with many repeat buyers converge lower than the formula suggests, and what does that mean for the check?<\/h3>\n<p>Because the formula counts additions and the list counts people. Someone who buys again within the duration does not become a member a second time; the re-add only restarts their clock. In the steady state the list therefore holds as many people as were added at least once in the last sixty or five hundred and forty days, and as soon as repeat buyers are among them, that is fewer than daily inflow times duration.<\/p>\n<p>The effect is stronger at the long duration. A customer who buys every month sits on both lists continuously and counts exactly once on each; a customer who buys once stays on the long list nine times as long as on the short one. The 9 : 1 ratio therefore holds for members who are added only once, and the more repeat buyers a list carries, the closer it moves towards 1 : 1.<\/p>\n<p>For the check before shortening the duration, that is good news. The calculation from the article, current size divided by current duration times planned duration, assumes the ratio of the durations and therefore tends to underestimate a list with many repeat buyers rather than overestimate it. If that estimate is already safely above the floor, the shorter duration will hold. If it falls just short, the real size may still clear the floor, and a more precise count in the advertiser&#8217;s own system is worth it: the ratio between the distinct people added in the last sixty days and those added in the last five hundred and forty then replaces the assumed ratio of 1 : 9.<\/p>\n\n<h3>Can a short membership duration replace removing someone after consent has been withdrawn?<\/h3>\n<p>No. Expiry only takes someone out of the audience once their duration has run out, possibly weeks later, and it deletes no customer record. Anyone who withdraws consent has to be removed from the list straight away, by the same route through which members are added, and flagged in the advertiser&#8217;s own system so that the next sync does not add them again.<\/p>\n\n<h3>What does a shorter membership duration do to lists meant to exclude existing customers?<\/h3>\n<p>It makes the exclusion leaky. An exclusion list shrinks with the duration too: anyone last added more than sixty days ago drops out and sees advertising aimed at new customers again. The same applies when a list marks existing customers, for example for a new customer acquisition goal: whoever drops out counts as new again, provided the list is the only source for that distinction.<\/p>\n<p>For exclusions the longer duration is therefore usually the right one. If the same list has so far served both targeting and exclusion, a change calls for two lists with separate durations rather than changing the one setting for both purposes.<\/p>\n<\/div>\n\n<div class=\"lw-quellen\">\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/support.google.com\/google-ads\/answer\/6379332\" target=\"_blank\" rel=\"noopener noreferrer\">About Customer Match<\/a><\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A shorter membership duration does not shrink a list a little. In steady state a list is its daily inflow multiplied by its duration, so sixty days against five hundred and forty is a factor of nine on the same audience.<\/p>\n","protected":false},"author":1,"featured_media":16094,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[91279,91285,91288],"class_list":["post-12884","post","type-post","status-publish","format-standard","hentry","category-digital-marketing","tag-prywatnosc-danych-pl","tag-first-party-data","tag-google-ads"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Customer Match: 60 or 540 Days of Membership, Depending on the Method | Lukas Wojcik<\/title>\n<meta name=\"description\" content=\"Why membership duration decides the size of an audience list, what the arithmetic of a steady state looks like at 60 days against 540, and when the shorter list 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