I think it depends on the sort of work you do. We had some hubspot integration which hadn't been touched for three years break. Probably because someone at hubspot sunset their v1 api a few weeks too early... Our internal AI tool that I've build my own agents on updated our data transfer service to use the v3 api. It also added typing, but kept the rather insane way of delivering the data since... well... since it's worked fine for 3 years. It's still not a great piece of software that runs for us. It's better now than it was yesterday though and it'll now go back to just delivering business value in it's extremely imperfect form.

All I had to do was a two line prompt, and accept the pull request. It probably took 10 minutes out of my day, which was mostly the people I was helping explaining what they thought was wrong. I think it might've taken me all day if I had to go through all the code and the documentation and fixed it. It might have taken me a couple of days because I probably would've made it less insane.

For other tasks, like when I'm working on embedded software using AI would slow me down significantly. Except when the specifications are in German.