I'm older and work full time as well. I am also going back to school at community college part time. So between 2 courses per semester, work, and having teenagers, there isn't much time left!
But I do manage to do some art every day. On my lunch breaks I sketch or draw or plan out my next piece for a half hour. I usually can find at least another hour before or after work/class. I probably do art about 15 or so hours a week. I also listen to art podcasts sometimes at work or watch speed paints before bed.
I flip back and forth between learning and having fun. I started a couple of years ago, and do get frustrated I am not further along, but have to be kind to myself and remember I can only do what I have time for. I was a college art school drop out at 19 - if I had only stuck with it!