I think I'm somewhere on the long right tail of needing a lot of sleep, I feel best with 10 but I can do with 8. Less than 8 and I don't feel too good.
In the winter I can do 12 hours pretty often. It's not always but every few years I get a few weeks or months of 12 hour nights.
Not who you are asking, but for me if there's no noise or activity in the house, I usually just keep on sleeping. 10 hours would be more common for me but I've done 12 hours pretty easily too.
