When I was there, it was five minutes between open house rounds (when the order of houses made sense), ten between first and second invite rounds, and fifteen between prefs. There were campus busses you could catch if you *really* had trouble walking it, but as lovespink88 said, they wouldn't save you any time...maybe just some blisters or sweat.
And of course, as an active, you could try to guess which chapters the PNM's had just come from if they were late ;-)
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