What does the hotel room reservation time mean from 12: 00 to 18: 00?

Hotel room reservation time is 12:00- 18:00, which means you need to arrive at the hotel between 12:00- 18:00 to check in. If you arrive before 12:00, the hotel may not be able to provide clean rooms. And if you arrive after 18:00, your reservation may be problematic because the hotel may assign rooms to other guests. Therefore, you need to arrive at the hotel within this time period to ensure the successful completion of your reservation.