If I get 7.5 i'm solid. If I get less, on occasion due to kids or whatever, I will need to 'catch up' after a few days. I can survive on less, but I did lots of leetcode on low sleep and compared it to not on low sleep, and I can't solve algorithms as fast when i'm sleep deprived. I also can't focus as well. So generally, poor sleep for a software engineer is costly.
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