All Stridekick challenges have a default grace period of 72 hours, which gives all challenge participants an extra 3 days after the official end time of their challenge to sync their final activity data into the Stridekick app and their challenge before scores are finalized.  

Users will be notified of grace period rules in challenges that have ended directly from their challenge cards in their Stridekick dashboard or from the Challenges tab:

This grace period is built in so that any participants who may have forgotten to sync on the final day of their challenge, for example, will still have a chance to sync within the 72 hour grace period. 

Once the 3-day grace period ends, all challenge stats are final and totals can no longer be updated.