This.

Its not a hard 2 hours but rather "reasonable report" for which 2 hours is about right under fair conditions. Unexpected traffic, flat tires, etc can apply if reasonable. If the CHA pilot in question is 2-3 hours (I assume that was said because of traffic adding that extra hour) then most of the time s/he would need to either be in position or at least be closer. Some car commuters drive part of the way and hang out at a mall/movies/coffee shop/gym to hedge their bets.

That said, it would probably depend on the flying seasons. Peak seasons likely mean don't even bother, just be there. Slow months with good coverage maybe hang out somewhere in the Cartersville-Kennesaw area.