It's difficult because there's not really a "one size fits all" answer. It really boils down to your goals, and prioritizing them- Which is the most important to you?
Drawing this particular comic? Gaining lots of readers and becoming popular? Finding a way to make money/a living from your work? Having fun drawing comics in general? Etc.
Of course several of these might apply, but in this case which is the MOST important to you? For example:
So far in this thread, several people have already shown their solidarity and empathy of being in a similar situation, working on a story like this and the many years ahead that they will take to complete. But I'll offer a contradictory anecdote-
I was totally someone with a "The One" epic long fantasy story. I had begun writing it in highschool and spent years writing out chapters, designing characters, working out their relationships, character arcs, thinking about future arcs, even writing about some of them for creative writing classes in high school and university etc. In comic form it never made it further than chapter 2 as I got stuck in a brutal redo loop, but i had around 10 chapters written out in novel form, and more conceptualized in my head. I took a few years mostly off from drawing toward the end of uni but after graduating I discovered Tapas(tic) and it reinvigorated my desire to return to drawing and work on my comic!
I spent a few weeks rewriting the first chapter, scripting the whole thing out, and then sat down to begin drawing it. I was working at a pace of ~1 page per week, which is something I had heard a lot of people around here do, and I continued on like that for 2 months, completing 8 pages. I was really satisfied with how the comic was turning out tbh. It was a massive upgrade over the last iteration I had attempted in high school (through college I never draw any comic pages, mostly just character art).
But then I read a topic here that led to an epiphany for me- It was about comic creators without much experience under their belt biting off more than they could chew with these huge long projects that either end up being abandoned when the creator fails to realize how much time and effort actually goes into making a longform comic, and starting a new project, thus never getting practice at "middles" and "ends" at worst, or at best making it through somehow but investing soooooo much time into a single project that you're left wondering if it was the right choice. That caused me to take a step back and evaluate my own project. Each chapter would be about 20 pages long, and it was an action fantasy story (think like a shonen manga). The first cool action scene happened in the middle of chapter 3 as I used chapters 1 and 2 to set up different aspects of the premise. So that placed the first action scene of an action comic roughly 50 pages in. At the pace of 1 page per week that I was moving at, that would be roughly 12.5 months of drawing time. That really put things in perspective for me. A little over year of set up. And who knows how many years after that to completion.
It was at that point that I officially made the decision to drop that comic indefinitely and move on to work on different comics. Don't get me wrong, that story is still incredibly dear to me, and I still draw its characters from time to time for fun, but it ran contradictory to my goals as a creator. I decided that I wasn't married enough to that particular story to devote my life to it, rather I was more interested in gaining a reader base (primary goal), have fun making comics in general (secondary goal) and perhaps someday down the line make a small amount of money (like attending cons or wev, tertiary goal). Following, I ended up writing my first comic on Tapas which wound up being a 70 page one-shot that ran from October 2018-December 2019 as well as a short 10 page comic over the summer. And I feel so good about that decision honestly! I have 2 complete comics under my belt at this point rather than maybe just baaaaarely being past that first fight scene that I mentioned above. Looking forward, I have a new longform comic idea that I'm very interested in pursuing in the near future... but I'm not ready yet. I promised myself that I wouldn't start anything much longer than that 70 page one-shot until I get my drawing speed to the point where it could be completed in a reasonable time frame lol. Like maybe 3 years or less.
At the end of the day I don't mean this wall of anecdote to turn you off from working on your comic, especially if your main goal is making this particular story! But I just want to emphasize that you're not necessarily married to it and it's never too late to change your mind if you find you have other goals you'd like to accomplish, and perhaps spending 10 years on this one comic wont get you there. If you do continue with this particular comic I do agree wholeheartedly with some of the previous comments that you should consider trying to edit it down as much as possible though, for your own sanity Imagine a version that could be completed in like 6 years, for example. That would be a considerable gain!