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When I talked to Peter Snell, he told me, as I've heard before in other places, that things start happening after 90 minutes on a run that you don't get at shorter durations. I'm not even going to try to say what those things are. So 90 minutes might be some sort of threshold. But the longer you go beyond that, the more benefit you get up to a certain point. Greg MacMillan has a post somewhere, maybe not this thread, where he says that he thinks 2:15 is sort of another threshold and that beyond there you run into diminishing returns.
So I'd say to try to get the 2 hr run in each week unless you're really struggling with it. Then back away to 90-105, etc.

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