You can keep learning, just slowly. But it works: I decided a while ago to go back and learn the parts of CS that I skipped that felt unreachably wizardly to me. I'm currently working, very slowly, through the excellent Coursera compilers class, 25 minutes at a time on the bus to and from work. I say go for it :-)
I recently started to bring my laptop when travelling on the subway. Itβs very nice to see that one can actually make progress (albeit slowly) on a project even with just 50 minutes a day (or less). 'patio11 inspired me :)