When booking a hotel, what does the reservation time mean?

Because you didn't pay, but you placed an order, the retention time is that the hotel will keep this room for you until the arrival time you wrote, and it will not be sold separately. If you haven't checked in by the time, turn this room into a vacant room and sell it. For example, 17 arrived at the store, but you arrived at eight or nine in the evening, so the room is probably gone.

I suggest that if the arrival time is uncertain, you can call the hotel to communicate.