Customer Match lists capped at a 540-day maximum membership duration via the API from April 7, 2025

Requests setting UserList.membership_life_span above 540 days return RangeError.TOO_HIGH from April 7, 2025, and existing lists with longer or unlimited durations were migrated to 540 days. Advertisers must refresh Customer Match lists regularly to keep audiences from shrinking.

The same 540-day cap applied to Display & Video 360 API firstAndThirdPartyAudiences (membershipDurationDays). Leaving the field unset in the Google Ads API is equivalent to the 540-day maximum.