How long should the perfect nap last?

“Nap o’clock” has been pinpointed at 1:42 p.m., according to new research. The survey of 2,000 general population Americans revealed just before a quarter to two is respondents’ ideal time to take a snooze. They believe the perfect nap should last 51 minutes, meaning they’ll wake up at 2:33 p.m. Commissioned by Avocado Green Mattress and conducted by Talker Research, the survey found if respondents’ naps go 35 minutes over that — lasting an hour and 26 minutes or longer — that’s the “danger zone” where it does more harm than good.