Haha, uh, I just looked, I do 3 miles in about 30 minutes, at my age I'd have to do it in 29, I'd fail by a minute. Plus I bet realistically marines my age are doing 3 miles in more like 24 or 25. Ultimately though, for the situations I imagine physical fitness being important in, I don't think running is the key, it is how I elect to keep myself reasonably fit (but like I said, I've got a long way to go), but I don't think it in itself is critical.