Board Thread:General Discussion/@comment-5138166-20170727174106/@comment-29690647-20170806155515

For the Goku event, it states it will be:

"8/12 (Sat) 7:00 ~ 9/4 (Mon) 06:59 PST"

If you read the bottom of the new feed, it states clearly:

"* Please claim the rewards by 2017/9/4 (Mon) 22:29 PST"

I'm pretty sure that they wouldn't give you less than 1 day to claim your reward.