4 usually. Once a month or so I'll get 6.

If true, talk to a doctor. Something in your life is out of whack and there may be a very easy fix. Look at your diet first.

I'm good with 6. More or less than that and I'm not operating properly.

The cheapest fitbit flex

https://www.fitbit.com/uk/shop/flex

6-7. If I sleep more than that it I seem to be tired for the entire day.

Checked random sleep apps on andorid, according to reviews - absolutely unreliable. And how could it be? I mean they are talking about counting deep sleep, medium sleep, light sleep cycles etc. It is not possible for the phone to do that reliably.
Mostly for fun.

4 to 6 here

2 to 5 hours continuous/ 7 hrs in a 24 hr period.

8-10 - if I need to be able to work entire day
6-8 - if no work is involved

between 6-7h

I'm fine with 6-7 hours :)

There are days when I need 2 years of sleep and there are some days that I can take a 30 min power nap and I'm good to go

I sleep only 4-5 hours a day

10 hours at least :O

I usually get 6 hours sleep. But I think 8 would be better for me.

I thought I was the only one who felt fucked up after 6 hours.. guess not !

Nine is ideal

Yep, same.

5 to 6 hours.

8-10 hours

6 hours are just enough for me... :)

7-9 hours, depends on how much alcohol I have in me...