Excuse me, I'd like to check into the hotel around 9 am and check out at 7 am the next day. Is it 1 day?

It depends on what the hotel is like. Because most hotels can only check in after 12 ~ 2 pm. Then check out before 2: 00 ~ 12: 00 the next day.

Therefore, it is reasonable to say that the hotel will not let you check in at 9 o'clock unless it happens that no one is there. You should discuss with the hotel and let you check in early. In this case, there is only one day's charge.

If the hotel won't let you, you may not even be able to stay.

If the hotel rules are strict. You can stay in the hourly room first, and it will be a normal day after 12. Charge in this case = 1 day +4 hours room rate.