It's hard, ngl.
During high season, I can work up to 12hrs a day without much time during the day to sit down for water and food, let alone writing (novelist, here). I find that I can draft when I'm dead-dog tired, but editing is impossible, so I optimize and schedule my time to draft on workdays and edit / schedule posts / do general housekeeping on days off.
When I'm working a 8-10 hr day, I can usually expect to draft between 1k and 2k after work (so -- 50-100% of a new chapter). When that day becomes 12+ hrs long, I'll be lucky to zombie out 500 words before my brain collapses in on itself. Still, 500 words / day is 2.5k by the end of my work week, which is usually a complete chapter -- and I can push harder when I know I'm off the next day. It's not as prolific as I'd like to be, but minimal progress is still progress.
Over the weekend, I'll edit multiple chapters and write around 5k.
Everyone has different speeds, different abilities, and different obstacles. I'm not saying 'I can do this, so you can/should, too' -- I'm just giving the novelists out there one possible option out of many. I'm healthy, I work a physical labor job (I swear sitting at the computer working all day makes writing harder for me than being physically tired!) and work doesn't follow me home. I have no children, my partner is ultra-supportive of my writing ... so I'm in a pretty good place.
I do honestly believe that the only way to make it happen is to turn it into a routine activity. I'm not sure how much of a comic can be done piecemeal, but I force myself to write every day, even if I'm only tacking on a few paragraphs to a draft in progress.
Every little bit counts, and keeps your brain focused on your creative work. And to be fair, I think my life is healthier and more balanced for having a consistent creative output ... even if it means more work for me!