Feel free to answer below without reading the rest as I'm just gonna ramble here!
This topic became something I thought about since recently I've been watching videos on the production of 'The Overcoat'- an unfinished Russian animated film that has been worked on for over 40 years (ongoing.) Now I've gone down a bit of a rabbit hole of animated films that took decades to create, and I'm just thinking to myself: LORD. I could never put myself through that.
And a recurring seen with these projects is that the creators are absolute perfectionists, and will redo things over and over until they see it as perfect. They have a vision they're unwilling to take shortcuts for. An interesting video that drew me into the topic was Lars Martinson's video on how it took him 13 years to complete his comic:
This really got me thinking about my own projects and how long I'd be willing to work on them. I think on how sometimes I have the urge to go back and redo pages, and how pushing through despite imperfections is for the benefit of my projects, especially since little things like janky pages will be looked past in a couple seconds.
I have this long epic fantasy story that I've had since I was thirteen, and honestly if I didn't put it on the backburner I feel like perfectionism would have eaten away at me and ended with me having a project that takes years and years and no satisfaction. Thing is with that project, I'm willing to spend years and years and years on it when I make it my main project someday. It's a story that I really want to tell, very likely because of my nostalgia and connection to the characters. Now, I'm alright with it not being the "most amazing thing ever" as my thirteen year old self thought. Hell, people may think my other projects are better, and even if they are, I don't mind. It's a project I want to see become the epic fantasy I've had in my head, and I'm okay with it taking a while.
For The Commune, I don't even know how long I'd end up spending on this project. My current estimate is 7-8 years if I don't have any assistance. Could possibly be longer. And this still sounds pretty daunting for me, especially since this comic was meant to be a short story that expanded into a much longer one. Thing is, I am willing to work on the story for that long because it means a lot to me, and having the story written out, I know it's interesting and satisfying, at least to me. I know I'm working towards something good that I and my readers will finish and go "ah. This years long project was worth all the investment."
I'm willing to take shortcuts, and allow for imperfections because I never want to be stuck in that loop of redoing when there's so much of the story to tell. Because, in the end, people read comics for a good story and characters, not to gawk at little mistakes in panels. I do not want to spend decades on this project.
So my answer to my own question with these considerations is: I want to spend as long as I need, in a way takes shortcuts and allows for efficient creation but to a quality I'm satisfied with. This will vary from project to project, but I want to feel what I've created is really worth all the time and love I've put into it.
(but like 20+ years on one project sounds absolutely crazy for me!)