“Too much work” is subjective. Personally I’m someone who does the slow and steady approach I.e I read things three or four times for it to really sink it but allocate time for it and plan around that.
Others I know can read something just the once and their revision can be literally half the amount of time I’ve allocated and absorb the same or even more information.
It’s down to the individual but instead of working your way down, maybe if possible work your way up the number of hours you work (maybe 8 or 10 hours) and if you can handle it, then work up to 20?