My sweetspot is 5.5-6.5 hrs. (+caffine) I’m slightly on the ADHD spectrum, so the mix of bodily stress hormones and deep sleep is just right.

But that’s just me. Everyone is different.

e/OS. I have it on my FairPhone5, and it’s great for getting rid of google.

https://doc.e.foundation

Of course graphineOS is more secure, but my main concerns are privacy and sustainability, so it was by far the best pick for me.