Lmao, this is just so absolutely ridiculous. Nobody needs to spend that long outside of work keeping yourself current... it's much more effective to just try to transition your actual work-work to being current and maybe spend a few hours here and there working on something interesting.

If your current job isn't keeping your skills up to date, you need to switch ASAP. But even if it's not and you can't switch... jesus, it doesn't take 20hr/week to learn some new stuff