most people are paid as full time salary employees, aka 35-40 hours/week. You may feel that you personally do way more work than everyone else (80%+ plus of people do) but you don't get to define what "the actual amount of work you are paid for" is. There's usually lots of opportunities to find time to learn or go on tangents in non-terrible jobs, but unless your boss is quiet quitting as well, they - and your coworkers - will know, and this will screw you far more in the future than just quiting and getting a new job.

The actual amount of work someone is paid for is the minimum amount of work that will not result in being fired.