If there is a break in data, Facebook replays can be implemented for a maximum of 7 days of historical data. Facebook's event_time can be up to 7 days before you send an event to Facebook. If any event_time in data is greater than 7 days in the past, Facebook will return an error for the entire request and not process the event.

This is a FB limitation and not a Segment one, as their API would reject any event older than 7 days.

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