I once worked at a place where I built out a bunch of internal tools that became pretty heavily integrated into the development workflow. Everything I built was the shittiest, most disgusting piece of garbage I’ve ever seen, but it worked. My job became solely managing these tools, as everyone else struggled to read and comprehend my filth.
I ended up switching jobs because they wouldn’t give me the compensation I asked for and half of the development team quit before my 2 weeks was up to avoid dealing with my slop, a lot of them were already considering leaving for lack of compensation, but this was the nail in the coffin.
I found out a few months later that instead of just going back to life without these tools or finding someone to take them over they just shut down the development department. The people who were left either got fired or moved to a different department to pursue a new career path.
I find that I’m pretty much useless after 4 hours. I usually do a 4 hour stretch during the day and then hop back on for another 2 hours when the kids are down and that seems to be the most productive for me.