Rescheduling iPhone 17 Pro pick-up time

I scheduled to pick up my iphone 17 pro tomorrow, but I will most likely not be able to show up at that time anymore. How long will they hold my order for? Will it be canceled if I don't go get it tomorrow? Is there a way to adjust my check in time?

[Re-Titled by Moderator]

Original Title: IPhone 17 Pro Check-In