You are suposed to sleep around 8 hours every night, however you should also take a nap in the afternoon which has it's own benefits so you cant use it to replace your night sleep. At least 8
It varies hugely.
Some people can function with only 3 hours per day others need 8 - 9 hours.
Most need about 6 - 8 hours
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the best you should try to do is 10 hours, the least should be 8 hours.
The governments recommended sleep length is 11 hours for under 13s and 9 hours for over 14s and 8 hours for adults
A man should sleep for about 6 to 7 hours. Sufficient sleep has many benefits and helps to lead a peaceful life. It helps to increase the concentration and also the brain power.