How much does it cost to stay in the hotel after 1 a.m.

In this case, it will be charged by the day.

Hotels generally stipulate that one day is counted from noon 12 on the same day to noon 12 on the next day, and half a day is counted from noon 12 to 18, so check-in in in the early morning should also be counted as one day's room rate.

If you book a hotel online, when booking, the page will show when to book the room. Generally, the store will keep the room until two in the morning, and there will be obvious tips on the page.