Yeah the 50% "goof off factor" seems about right, all work and no play make jack a dull boy....
I want to ad my 2 cents on something, tell me what you guys think.
When I first started flying, I had trouble landing for the longest time, I was forever trying to "spot land" right in front of myself, I mean for years! I was concentrating to much on the spot, and not on the landing. So... when you are practicing landings, or touch and go's, do you try for perfect spots, or perfect landings?

Jetts