Then don't take a salary. Nobody is forcing you to work for a nice salary. If you want to be paid by the hour so that every hour is accounted for then go for it.
I later in my career learned you can actually invert it by just being really effective in a shorter number of hours and work 6 hours a day and just leave the nerd next to you to expire from burnout. But it helps being later in my career and knowing how to be more effective in a shorter time.