Can I book a hamam in the evening?
Yes, subject to the venue's hours and availability. Check the last treatment start time, which may be earlier than closing time.

Related questions
How long should I allow for a hamam visit?
Add changing, check-in and rest time to the advertised treatment duration. A 60-minute treatment does not mean you will be out of the building in exactly one hour.
How can I combine Sultanahmet sightseeing with a hamam?
Group nearby sights and leave a separate appointment window. For Golden Royal, use the address on Peykhane Sokak rather than a generic “Sultanahmet hamam” map result.
How do I choose a date and time for my hamam?
Select your preferred date in the form and tell the team your preferred time when contacted. Wait for the agreed slot before making fixed plans around it.