Try different amounts until you find what's right for you

10 is very likely to be wrong

Sometimes less is more

Do not look at any screens 1 hr before sleep 

 so 10 is too much you're saying?

what about naps? are they good or do they mess up the rhythm?

the screen thingy felt like a personal attack, so it's time to change that 😆 

 If you feel drowsy with 8 hours, try 7, not 9. If you're super sensitive, you can even try to fine-tune it, like 7.5 hours. But it sounds unlikely that you feel well sleeping 9, 10 hours regularly (barring some sort of condition). 

 maybe i'm just a master eeper

my record is 15 hours in a row (don't recommend)

i'll try out a regular time of going to bed and waking up without an alarm clock, to see what my body feels like