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In Firebase Analytics, “Membership Duration” refers to the number of days a user remains a part of a particular audience after they have fulfilled the conditions to be in that audience. When setting a “Membership Duration”, you can determine a specific timeframe for how long a user can be part of an audience. For instance, if you set a “Membership Duration” of one month, then a user who fulfills the conditions will stay in that group for a month, regardless of any activity or lack thereof during this period. If during this period the user does something that fulfills the requirements, their “Membership Duration” will reset. Setting the “Membership Duration” to the maximum limit means they will remain in the audience for as long as possible, in this case 540 days. If the predictive metrics of a user change daily and they are no longer predicted to churn, they will not be removed from the audience immediately. They will remain in that group for the duration that had been set, which in your example would be a month.
