I actually meant 5 duolingo lessons of two minutes each. In 50 minutes I guess you could complete 25 lessons if you're on turbo mode. ;) Probably not however. It's like a sprint. Sprints are for shorter distances usually. (At least the 95-100% ones. Somewhere around 80 to 85% I guess is also manageable for longer distances if you train yourself long. I guess not so much for 95-100. Although never say never.
Regarding your day hour spending estimates: Some people also work 8 hours.
Besides all that I think one can devote 1 hour, 2, 3 or 12. Maybe even 14-15 on some days. Maybe even more if you're inclined to sleep less. It is all a matter of what is the price you're willing to pay, and what is your main purpose. In fact, the most successful people so far as I can see, are the ones that are willing to sacrifice all else, and devote themselves completely to one thing, leaving absolutely everything else at a minimum, and doing that for years. That is what is required, but of course, most people won't do that. That is why most people are average. The extent we do it with usually correlates with their amount of mediocrity(stagnation)(I say stagnation because that is what happens when we try to go in all directions at the same time)/performance I guess :)
It is really the most reasonable thing to do, and the most effective one. (I mean to give most of the things up) But we keep telling ourselves some dumb, unreasonable, unobjective s***, to avoid changing habits, or losing the knowledge we gathered in some areas or "insert excuse ______" Myself included of course to some extent(We are all on the spectrum there)
Getting used to something, or not feeling that it's abnormal doesn't mean of course that it is healthy :)
It is hard to really say how it affects health.
But I guess you are probably right that in a certain amount the body does reduce the requirement for sleep, when it's a little bit less than the "perfect optimal", so like on 7-6.5 hrs it can still compensate with some hormones which build longer term dealing mechanisms with the temporary lack of sleep somehow... However I don't think it will work on 4 hrs. It is also a question whether it will on 6.5 - 7 hours. I guess both are possible, but I find the 7-6.5 hrs intuitively more likely to be possible.
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Yan ·