Hey Scott.....not nit-picking....but seeking clarity
"legitimate" shot opportunity is what I think you're after. For instance....if I have the buck at even 0 yds....and no ethical shot......I'd say that wasn't a shot opportunity.
So....in less than 3 seasons....I've had 8 encounters with a mature buck at less than 20 yds. I've only had 4 (and that may seem high to many) "legitimate" shot opportunities, though (for whatever reason).
46 hunts in '06......48 in '07......likely 30 in '05.....average sit of "probably" 3.5 hrs. +/- 434 hours on stand.....with 4 shot opportunities = over 100 hours logged per opportunity.
In thinking back....my average sit is likely longer than 3.5hrs.....but I'll stand by the 100+/1.