At my last job many years ago, I basically used it as a glorified study room and only would work about 30 minutes a day until I graduated and found a new job.
For context, when I first started, the girl who trained me showed me how to do the job slowly so it would be the only thing they would give me to work on. It was a logistics company and they hired drivers to deliver goods to warehouses around the West Coast and Southern CA. This task was simple because I just had to document how long a truck was at the port of LA/LB between showing up, waiting to get in, getting loaded/unloaded, and then leaving to wherever they had to deliver.
The thing is that there was an online report that was generated by our system that populated most of the information automatically but some information on when they entered or left was missing which is what I had to fill in. Depending on how many trucks worked the day before, this could take 30 minutes to up to 2 hours. The girl before me showed me how to stretch the work so it would take up the entire 8 hour shift so that is what I ended up doing.
After a while, I realized I could finish the work early and put in random times that were between 30 minutes - 3 hours of the driver having arrived to the ports and leaving because no one was verifying the information on the report anyway. I don't know who it was going to or what they ever used it for but they just never verified or check anything, I just completed it weekly and sent it over Monday mornings. So after I saw no one was checking it I started finishing my work early and just fucking off in my cubicle for the rest of the shift.
After a while it got boring and I was attending a CSU at the same time so I started using this time to work on my English essays and Finance homework at work instead of at school or at home. I spent an ungodly amount of time sitting at my desk and typing away or working out math problems on my notebook. I had to get a silent keyboard because nothing about the job required that much typing and I had a feeling people would get suspicious. I would have had to spend countless hours at home studying or the library and away from my 1-3 year old son at the time. Instead, I was able to finish all I had to do at work and go home and hang out with him or take him and his mom out for the evening.
During the times that I didn't have homework, I eventually started bringing my Switch because I was playing Breath of the Wild for the first time and I was completely hooked. I took the Joy-Cons off the console and put the screen on one of those desk cell phone holders, without the joycons the Switch is just a screen that to most people if they aren't paying attention will assume is just a phone lol. Then I just hid the joycons under my sweater sleeves and rested one hand on my mouse and another one the keyboard while I played away!
I eventually graduated with my Bachelors in Finance and I found a better opportunity right out of college. I sometimes think about whether I was taking advantage of the company (which I obviously was) or if they were just poorly managed and had no idea what their staff actually did all day.
Either way, I got paid to do homework, play video games and finish my degree.