Most hotels do not have a strict deadline for check-in and many offer 24-hour front desk services, allowing guests to check in at any time, day or night. Standard check-in times are usually between 2 PM and 4 PM, but you can arrive later without issue, especially at large hotels. Smaller hotels or bed and breakfasts may not have 24-hour reception and often require guests to check in before about 10 PM. If you expect to arrive late, it is important to contact the hotel ahead of time to inform them and ensure someone will be available to assist you. Some hotels may have special late check-in procedures like key codes or self check-in kiosks for very late arrivals. A guaranteed reservation generally means your room will be held no matter when you arrive, but calling ahead avoids the risk of your room being given away if you arrive very late, such as after midnight. Overall, the latest you can check in often depends on the hotel’s size, type, and policies, but many major hotels accommodate late- night or early-morning arrivals with their 24-hour desks.