I became aware of the 1000 Day Rule on the Indie Hacker Podcast with Tommy Griffith. In the podcast he basically says that often it takes 1000 days to replace your income.
So I looked it up. On TropicalMBA it says -
The 1000 Day Rule: Our basic hypothesis: you’ll be doing worse than you were at your job for 1000 days after you start your muse business.
There's a bullet point list in the article above of the different stages of the 1000 days, which I thought was interesting. Yes the post is a bit old. Yes it often refers to the marketing/ebook/affiliate type stuff, but the bullet point journey list is not far off what I experienced.
I then remembered that I posted the revenue from Ministry of Testing, and it was in year 3 of proper business building that it actually replaced by proper income. Interesting :)
Obviously, this won't necessarily apply to everyone, but as a general guidance for indie hackers I think it is useful to be aware of. I often see frustrated indie hackers who are new on their journey. where they aren't see results straightaway and give up hope a bit too easily.