Originally Posted by Drip

It's safer to asume it does have a deadline. Especially if the selection of girls available is subject to change, holding out and hoping for a certain girl to enter the pool is generally not advisable. Even Flower Gems you buy have an expiration date. Strangely enough, Flower Gems you receive from the game do not.

OK ... If I did not collect it in the present box, it might be used in the next six-star ticket after refreshing; this is my assumption.
But in fact how ... I do not know at the moment, want to try.