> It was all very doable and not useless time spent futzing around (I would also stop tracking my time for any break I took - no exceptions).
I have a similar experience working remotely. I can be productive 40+ hours a week without getting drained.
But this includes making rather long breaks between blocks of work. Usually this ends up in blocks of ~2-3hours with breaks of ~1hour in between. Although this works out my end of work is rather late (typically I work from 8am to 7pm) which leaves little time to do private things.
So in conclusion, although this works out I am looking into reducing my work hours to 30 hours per week to have a bit more time for myself.