I suppose it depends on when you start counting. If we go by when the MCs were first created, Adi goes back to some writing I did with my then-friend-now-husband, back in 2012. Koreal, one of his old DnD characters, goes back even further.
We continued to write stories with these characters for most of a decade, off and on, but the idea to finally make their story into a comic didn't really occur to me until 2019. At that point, I had tried (and failed) to script several other ideas, and was at a loss and sort of desperate. And then I thought... 'why don't I just use this thing my husband and I have been writing for most of the time we've known each other??? It's not like we don't have enough material to pull from!'
So I started writing the script for chapter 1 in 2019, spent about nine or ten months doing that, and started drawing the prologue in October of 2020. I was afraid to post before I knew I had enough momentum behind me, so I built a buffer of 30 pages before I finally started posting in April 2021.