1, hotel stay is generally charged for one night.
You can check in around 12 in the morning or at any time (in the morning), as long as there are vacancies in that hotel. You can sleep one night, check out before 12 in the morning, and only need one night's accommodation the next day.
3. Some members of some hotels (compared with 7-day hotels) can give you an extended check-out time of 1-2 hours, which means you can check out on 13 or 14. Ask the hotel front desk directly when you can check in.