Yes. 2 hours is enough on uberman, if you do it carefully
The record is about 50 years of 2 hours a day, by the famous rabbi 'The Vilna Gaon'.
Also purely naps.
You can't compare monophasic sleep to polyphasic - they're just totally different in how they work
You naturally can't survive on 2 hours of monophasic sleep, but hardcore uberman works just fine (albeit by some careful lifestyle changes)
I did uberman for a month, and felt great. Only family responsibilities broke the routine.
DISCLAIMER: Just because I and the Vilna Gaon can manage uberman, doesn't mean it doesn't have an unknown, negative long term effect on most people. YMMV
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