Meta‘s own developer documentation now confirms it. Website custom audiences can stay active for up to 365 days before a person drops off the list, unless they visit your site again and match the rule a second time. That’s a full year of retargeting reach, doubling what many advertisers were used to working with before.
If you’ve been rebuilding or refreshing your retargeting audiences frequently because they felt like they were shrinking too fast, this update directly changes that math. Your custom audience duration now stretches much further than it used to.
Let’s break down what this actually means, and how to use the extra runway well.
What Changed With Custom Audience Duration
Previously, many website custom audiences were commonly built around shorter windows, often 30, 90, or 180 days, depending on how advertisers set them up. People who visited your site would drop out of that audience once the window closed, unless they came back and triggered the rule again.
Now, Meta’s documentation confirms the maximum duration has been extended to 365 days. This means someone who visited your website nearly a year ago can still technically remain part of your custom audience, giving you a much longer window to bring them back with the right offer at the right time.
Three Reasons Custom Audience Duration Matters
1. Longer memory means better long-term retargeting. Not everyone buys quickly. Some people need months before they’re ready, and a longer custom audience duration means you don’t lose access to these slower-moving prospects as fast as before.
2. Less audience rebuilding. If you were refreshing your retargeting lists frequently just to keep them populated, extending your custom audience duration reduces how often you need to manage that manually.
3. Better use of high-intent visitors. Someone who viewed a specific product or added something to their cart six months ago is still a warmer lead than a completely cold audience. A longer custom audience duration keeps that warmth accessible for retargeting much further down the line.
What This Means for You
If you’re currently running website custom audiences, review your existing duration settings. If they’re set well below 365 days simply out of habit, consider extending them, especially for higher-priced products where people naturally take longer to decide.
This is particularly useful if you sell something with a longer buying cycle, like a course, a service, or a bigger-ticket item. A visitor from several months ago might finally be ready to buy, and now you have a real chance to reach them again instead of losing that opportunity entirely.
That said, longer doesn’t automatically mean better for every situation. If you’re promoting something time-sensitive, like a limited sale or a fast-moving product, a shorter window might still make more sense. Match your settings to how your specific buyer actually behaves, not just to the maximum number available.
A Simple Example
Imagine someone visits your website looking at a premium online course, but doesn’t enroll right away. Under a 90-day custom audience, that person would have dropped off your retargeting list after three months, even if they were still genuinely considering the purchase.
With the new 365-day window, that same person stays reachable for a full year. If they come back on their own eight months later and finally decide they’re ready, you still have the ability to retarget them with the right message at exactly the right moment, instead of having lost that connection months earlier.
How to Adjust Your Audiences
Review your current duration settings. Check your existing website custom audiences and see how they’re currently configured.
Match duration to your buying cycle. Longer consideration products benefit more from extending toward 365 days. Fast, impulse-driven purchases may still work better with shorter windows.
Segment by recency, not just duration. Consider building separate audiences for recent visitors versus older ones, so your messaging can differ based on how warm or cool that lead actually is.
Refresh your creative for older segments. Someone who visited nearly a year ago needs a different message than someone who visited last week. Adjust your retargeting creative accordingly.
Mistakes to Avoid
Extending every audience to the maximum without thinking it through. Longer isn’t automatically better for every product or offer type.
Sending the same generic retargeting ad to your entire audience. A visitor from eleven months ago and one from last week are not in the same mindset. Treat them differently where possible.
Ignoring your funnel and email marketing habits. A longer custom audience duration works best alongside consistent email follow-up, not as a replacement for it.
Forgetting to periodically review performance. Just because someone stays in your audience longer doesn’t guarantee they’ll convert. Keep an eye on how older segments actually perform compared to newer ones.
The Bigger Picture
Retargeting has always been about staying visible to people who’ve already shown interest, without wasting budget on completely cold audiences. Extending custom audience duration to a full year gives advertisers more flexibility to work with naturally longer buying journeys, especially in categories where trust and consideration take real time to build.
Advertisers who take a moment to adjust their settings thoughtfully, rather than just defaulting to the new maximum, will get the most value out of this update.
FAQs
1. What is the new maximum custom audience duration?
Website custom audiences can now stay active for up to 365 days, according to Meta’s own developer documentation.
2. Should I set every audience to the full 365 days?
Not necessarily. Match your duration to your product’s buying cycle. Longer consideration purchases benefit more from extended windows, while fast, impulse-driven products may still work better with shorter ones.
3. What happens if someone doesn’t revisit my site during that window?
They drop off the custom audience once the duration ends, unless they visit again and match the audience rule a second time.
4. Does this replace the need for email marketing follow-up?
No. A longer custom audience duration works best alongside consistent email marketing, not as a replacement for it.
5. Should I treat older and newer visitors the same in my retargeting ads?
It’s better to segment by recency where possible, since someone who visited months ago is in a different mindset than someone who visited recently.
