How do novice Tibetan monks meditate 23 hours a day?
One can get by on little to no sleep when one mediates a lot but it requires a lot of learning and jhana.
If one had a good novice and a good teacher, under perfect conditions, then i think it is maybe possible to train some person in this way.
However in practise when one gets to little to no sleep stages then one will often skip a night altogether or find oneself too restless to sleep at a particular time.
Even Buddha's novices didn't do this and monks were advised to sleep in the 2nd watch of the night.
Therefore i don't think one can find a place where novices sleep only an hour a day lest they are forced to do it.
Forcing one is abuse and isn't even useful for meditation. I imagine many places are abusive.