how often is the free shuttle bus/ free tuk tuk to bts on nut
I agree with the others. The tuku tuku is always avaible at the hotel to the bts.
The tuk tuk always waits in the hotel car park until someone asks to go to the bts. If you don't have luggage it can easily carry about 4 people.
Get an answer from Klassique Sukhumvit staff and past guests.