Serious attempt at an answer: I was terrified of this myself. I felt super tired on much less, had no idea how I would cope with a full day of work plus coming home and going right back out to be social or whatever. I ended up having to do it, plus language lessons twice a week. I think you really do adjust, at least a little. You find ways to rest in smaller periods, in bathroom at work, going out for a break with the smokers, sleeping when you come home etc. I find a lot of things I ended up sacrificing but I also find it’s not as hard as you might think. I even manage to cook most days, and stay on top of household chores for the most part. It isn’t a brag, and I think I fall back on the same recipes time and again. It just sort of all gets forced to be optimised