I usually get 6-7 hours - depends how early I have to go in. I can’t go to bed before 10pm no matter what, so start time makes the difference for me. 
My missus is on flexi-time and usually gets at least TEN hours sleep a night…sickening isn’t it? 
prefer 6 to 7 if poss but will cope with 6 every day if needs,even on weekend,only ever mange to get to 7 am then up and about normally taking the mutt down the sea front.
About 5 - 6 hours per night, depends.
If i fall asleep during the day (weekends) i wake up with a banging headache all day,
For the last two months tramping its been 4 hours if im lucky it might have something to do with the fridge banging all night
Normally 7.
6 is fine but by the end of the week I’ll need an 8 to catch up.
5 is Ok for a few days but if i do it all week I’ll sleep for a good 9 hours at the weekend.
4 I can function on for the odd day but not regularly.
Normally 5 to 6 hours a night but i always end up feeling chinned come friday 