I accidentally started with a long story so I've been working on my comic for 12-ish years and I'm a little more than a third of the way through the planned chapters |D I started when I was 14 and probably won't finish the darn thing until I'm like...40-something. I'm on chapter 32 out of 90-ish, and I finish 3-4 a year, usually.
I've been trying to work on other, shorter projects on the side, like the novel I've recently started posting here, so this perpetually unfinished comic isn't the only thing to my name.
But, yes, I try not to think too hard about the time investment because it just...makes things worse 
(The aforementioned comic and novel, in case anyone was wondering:)
(Also regular comic site with full archive.)