I went through FireCalc only once a couple of years ago when I first found this site.
Now I have more money and if we go by 3 or 4% SWR, I could probably retire, though with the free time, I'd travel more which would raise my spending.
There are good days and bad days at work, though overall, it's pretty easy work, other than some long hours at times. Even then, I clock a lot of OT from home while watching TV or surfing.
Knowing that I could walk away makes the bad days more tolerable.