Usually if I sleep in past 9AM, intentionally or not, I wake up with a massive headache and my whole body feels sore. The latest I've ever slept in was 11:30AM and that whole day was miserable.
It depends tbh, usually the latest I wake up is 11 but when I go out from the night before and dont get it till about 6/7 AM then im usually in bed till 1.