He's 51 and a retired fire fighter, so he's still in pretty decent physical shape. I'm a fire fighter too, so I'm in alright shape as well. We are just doing a straight rim to rim with no side trips. First night is camping on the north rim, second day is to the bottom from the north rim, days 3 and 4 are back out the south side. All the research we've done sounds like 3 days 2 nights is about average for a rim to rim.