When is the best time to wake up after you go to sleep, 4.5, 5, 6 hours? If it is different for every one what time is best for you?

How long is it till you go back to sleep, i know this is different for everyone. So i can fall asleep really easy within 5 min of waking up but if it is like 10min it is difficult for me to go back to sleep. So would i stay up till maybe 7min and got back to sleep?