6 to 7 hrs. I'm more of a night owl and usually get to bed between midnight and 1AM. If I sleep past 7-730, I feel like I'm "burnin' daylight" . . . and I retired 5 years ago.
My dad was a world class napper. If he decided he needed a nap, he would, anywhere, anytime. Me, not so much, last time intentionally took a nap I woke up a day and a half later in the hospital. No thanks.