Around 8.5 hours (lights off to alarm ringing). Productivity is a bit complex to relate in a direct way (I can be "productive" also with less sleep), but I kno

Around 8.5 hours (lights off to alarm ringing). Productivity is a bit complex to relate in a direct way (I can be "productive" also with less sleep), but I know for sure that this is the amount I need to be 100% of my potential. Interestingly, I estimate that doing sports (which I do heavily) accounts for 30 to 60 minutes of my sleep - in other words, if I didn't do sports, I could sleep such amount less and be equally "productive", although obviously, my body would slowly decay.