He was a data analyst who was tasked with this daily report. He automated it and hid the automation, so for two years he did pretty much nothing until his degree was finished.
I have two full time (albeit remote) jobs and two part time admin/data processing jobs. ChatGPT and Copilot let me do far more work in the same amount of time but officially are not permitted, so I just sit on the work for days to ensure that I only produce at the same rate as everyone else. The two admin/data processing jobs are also nearly fully automated. I introduce random defects to the work product to keep expectations from rising.
I work fewer than 25 hours a week net now. Leaves lots of time for reading.
Figure out how to improve your productivity, but make sure your employer doesn't benefit from it. You can keep that improvement for yourself.