We used to sort of target 60, but after 4 years in our current rig we were just shy of 300 nights, so almost 75. Last year was a bit less (started spending more time on maintenence of our house and property mostly)...more like 50.
This year? We just hit 20 so are running behind pace. With that good chunk in early July for the Glacier Park trip we ought to be back on pace for at least 50 or 60.
Why keep track? Anything you like doing enough, that takes sacrifice of other options (really, anything) can use the positive reinforcement of goals and counting. It takes effort to do these things and it is easy to decide to stay home and sit on the couch.....or watch dust settle on the good china....or as the song goes "watching Sunday sports in your boxer shorts...." So why NOT count?