Can't say I'm the best person to give art/constructive time use advice, but I'd say don't sweat it too much if you can't spit something out everyday. I had similar issues as I got further into this, either because life, distractions, or because a piece needed more time to be just right, and that made the whole process more and more frustrating until I called it quits. I suspect a more spaced out schedule might work better (1 or 2 a week, so many a month, etc) though I haven't sat down and hammered a plan to try that yet. Don't force it; that's when things get sloppy and not fun.