Earlier quoted context omitted.
I don't think the concept of "limited amount of time" is flawed. Frankly, some people are constantly working and don't have time to meditate. It isn't that they shy away from it because it is hard or takes discipline and willpower, it is because we live in a world that (unfortunately) gives us a limited amount of time during the day that we can spend awake consistently if we don't want to possibly damage our health.
Fair enough. Still though, I don't know, I personally spend a lot of time on things that are not obligatory, so that time is mine to choose how I spend it. Family time, kid time, HN time... If you're "constantly" working, then that's a choice you made, right? [edit: just realized I sound kind of like an ass. I shouldn't speak for other people. Just read this as me talking to myself :)]
I guess the point is that for me, exercise is probably more efficient, time wise, in terms of benefits/time, and also includes some of the mental things that I think meditation must give you, but of course it's a fairly personal thing, and to each his own.