I actually do have the chance to stop working, and I plan to take it in about 2 years.
I don't believe I'll have the disciple to pump out regular updates, but I do believe I'll be able to 'do the work I need to do', which for me means devoting most of my time to working on my comics. Why?
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Boredom. My post-employment life will be pretty bare-bones; I won't be able to spend money to go places or access the internet for the entire day. So there's not much to do with my non-internet time except work on my comics.^
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But with all this time devoted to my projects, why can't I pump out regular updates? Because my working process is chaotic. I jump between different projects. Sometimes I go on a writing streak, and sometimes (less often) I go on a drawing streak. Sometimes I do behind-the-scenes worldbuilding and such, which would produce no immediately visible results. Still, on average I believe I'm more productive this way than if I forced myself to draw when I want to write XD
If I didn't want to, I don't think I'd have the 'disciple' to do this in the first place. And yes, given my working pace I believe I have enough (projects that I will be passionate about) to take an entire lifetime to finish.
But if I do happen to 'run out' (work faster than expected, lost interest in some of my projects and have no new ones to replace them with), then no, I won't be able to do it for the rest of my life 
^ "Combine rocks, sand, time, and not much else, toss in a mind just sophisticated enough to suffer from a lack of stimulation, and pyramids will pop up like mushrooms." - a quote from this Talos Principle fanfic that I'm quite fond of 