Less than 25 minutes you should feel refreshed, more than that you may feel groggy. Even if you only go into "standby" mode and don't actually sleep, the downtime typically leaves you feeling refreshed.
I worked a show with 70+ hour weeks for several months & those 17 minute (best length for me for some reason) power naps were the only thing that kept me sane.
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Less than 25 minutes you should feel refreshed, more than that you may feel groggy. Even if you only go into "standby" mode and don't actually sleep, the downtime typically leaves you feeling refreshed.
I worked a show with 70+ hour weeks for several months & those 17 minute (best length for me for some reason) power naps were the only thing that kept me sane.