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I think a good test is to go to bed at your normal time of night on a day when you don't need to get up early and do not use the alarm clock. When you wake up that is how much time you need to sleep.
I would get different results depending on my activities for the week/month before I did that test though.
What if I happened to have an extra stressfull, or unusually easy week at work before doing this ?
It would be like filling two identical buckets full of water, drilling a different sized hole in the bottom of each bucket, and determining how often both buckets need to be refilled based on how fast the water drains out of one bucket or the other.
If you time the small holed bucket, the large holed bucket will end up being empty.
If you time the large holed bucket, you will end up overfilling the small holed bucket.
Now, if you worked harder than usual the week before a two week vacation so you wouldn't be swamped with work when you get back, then did this test every morning during your vacation, you could add up all of the hours you've slept and divide that by the number of days, and probably get a fairly balanced number of hours to sleep over that 2 week period.