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About 1 hour and 30 minutes.
Unless you follow (something like) the Uberman Sleep Shedule.
In that case you can get 6 times 20 minutes of REM sleep, distributed over 24 hours (so 2 hours in total).
If you had to make 2 adjustment to your sleep schedule, what would it be and why
Eat, sleep, football.
By getting on a schedule. Eat right and Exercise!