I commute 2 hours total a day for my job, so honestly I'm pretty fatigued when I get home. I might be able to ink one panel but I go easy on myself on the weekdays. On the weekend I go hard, wake up early, and hang out at coffeeshops all of Saturday and part of Sunday.
Best thing I've learned don't force yourself to sit and work if that day is busy/full up, you won't properly focus and instead stare at your phone/internet, least it's that way for me : ( I also rarely play games and consume media HOWEVER podcasts have been my saving grace, I love My Brother My Brother and Me as a comedy podcast.
@GamerPrincessXI proper sleep is probably the biggest variable for if you'll be productive or not. Staying up late the night before you want to work rarely has good consequences. Or if you're a night owl, perhaps that's ideal lol