I have only ever done 100 mile weeks before; several strung together over maybe 4 or 5 weeks, but with almost no intensity to speak of.
I live in Okinawa, and while I was in the Marines there was a guy who ran the perimeter of the island for charity, Tom Knoll. He's still doing his thing, running across the U.S. I ran a portion of the perimeter run with him (only a few kilometers), but was in no way, shape, or form a runner in those days (just normal Marine Corps training stuff).
But, I always try to attach a higher meaning or purpose to things I do. I like to set lofty goals and shoot for them. If I don't, life sucks (sometimes if I do, life sucks).
A girl who used to be my student died last year of cancer and I really started thinking back to Tom and what he did to raise money for charity. But I'll admit, just thinking about running 250 miles around Okinawa sounds crazy.
What would I realistically have to do to prepare for something like that? I'm 42.
To help Cancer Guy
Sounds like a good fund raiser. Two suggestions
1) create a relay race around the perimeter and have the proceeds go to charity. If you make the legs short enough people can run the whole distance in large teams fairly quickly. Possibly get your unit involved.
2) if you really want to do it by yourself. Just break it up in to manageable long runs for you. There is really no reason why it has to be in a week. Get sponsors to sponsor your run and give to charity. Just camp out or have a chase crew with a camper follow you.
I'm no longer in the service. I would like to do it in a week just to have a real sort of goal to it, one, and two, because that's the way Tom did it previously. If I decided to try to do this, it would be beneficial to piggy-back off of what was done before and create even more interest and awareness.
A little over 35 miles a day would be required. I've only ever done 30 in a day before, broken into two runs. It wasn't that hard, and I was doing manual labor through the day between the runs, but I didn't have to get up the next day, and next, and next . . . and do it again.