When do hotels usually check in?

There is no fixed time. The check-in time of the hotel is stipulated according to the time agreed with the front desk, because the front desk of the hotel is generally served 24 hours, so if you check in at 9: 00 in the morning, you can check in after 9: 00. If you agree to check in at 2 pm, you can check in after 2 pm. If the appointment is 0: 00 pm or midnight, just come to the hotel and contact the front desk staff at the appointed time. There is no fixed time.