Max is about 3 days for me. I feel like I'm drunk or something because I can't think well.
>>328I've had a couple months of 3-4 hours of sleep when crunching hard on things before. It wasn't every night but the work was usually 80-100 hrs/wk and staying low on sleep seemed like an OK way to work at the time.
When you compound multiple days of low sleep you'll end up fucked so take it slow. On day 1 it'll probably be 80% of your normal work ability. Day 2 60%. Day 3-4 sleep needed or low productivity (no hard problem solving). After a few days just crash for half a day and go back at it.
I got used to it after a while and scheduled activities based on how much thinking it would involve. Too much sleep deprivation is OK for plug+chug work but hard stuff has to be done when you're fresh.
There's kind of a switch where you can sync with your body for how much sleep to get. If you know you're going hard you can brace yourself to deal with it. I don't if know others feel that but it's like a switch to force yourself awake. Like "I'm getting 3 hrs of sleep tonight, fuck you body" and you'll wake up 3 hrs later without an alarm. Kinda weird.
I wouldn't repeat again though… I made some mistakes and it ended up not being fun.