I got a job once at a video processing software company, camera streams etc. The tasks there involved a lot of reverse engineering of under or undocumented things, very slow - I felt like I was getting 2-3 hours of “accomplishment” accomplished on a typical week there, very demoralizing, but they swore that’s how it always is there and I’m actually unusually quick at getting things done… IDK, I got a better offer and was out of there to a more productive job fairly quickly.