Depends on the girl. Depends on her position. If she's bending over, looking away.. etc.. of course I'll take a look at the goods for as long as I can.
But.. what do I truly take-in and not just ogle? The whole face. Shape, size, if the fingernails are painted, what shoes are on her stems, if she looks like her name, imagining if her voice would sound good during orgasm.. if she's a drinker, does she smoke weed, blah blah.. those are the things that usually flash thru my mind in about a half hour on one girl that I'm actually interested in. Socially or otherwise.