This is the period or timeframe in which users will either need to sync or submit their activity results to BiiB after the activity has ended or completed.
The event's result submission period will be stated in the 'Rules' section of the event.
For example: If the result submission period is 72 hours and your activity ends 5th August 2021 at 2 pm. You will need to ensure that your activity result is synced or submitted to BiiB by 8th August 2021 at 1.59 pm.