Mental labor is hard, but learning I find fairly easy and quite relaxing. I only do about 2 hours or so productive mental labor / output a day, the rest of it

Mental labor is hard, but learning I find fairly easy and quite relaxing. I only do about 2 hours or so productive mental labor / output a day, the rest of it I spend self training and learning. I honestly can't imagine how far I would be behind my peers if I didn't do that. Sometimes I do a fair amount of training / mentoring for junior engineers as well. That can be pretty relaxing too and productive for the company.