I usually sleep about six hours plus an afternoon nap of 1 hour.
I always try to fall asleep by midnight and am awake by six in the morning.
In the afternoon I usually sleep from 3 to 4 pm, or in any case in the afternoon I go to sleep immediately after lunch after having a coffee... if instead of an hour I do an hour and a half it doesn't make me sick eh eh!
Consider that six or seven hours is enough for me, but I love to sleep 😉
Sometimes breaking up your sleep like that can be a useful tactic. I much prefer doing it all at once and thus never needing to nap.