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John this is one of several threads you have started about the same thing.
Long slow back to back runs are generally accepted as what to do for such events. So 40 or so one day, then 20-25 the following. I dont think you ever need to go beyond 50 miles or so in any one day.
As nick said long slow back to backs... On the day itself dont go out too quick. There were loads of people I caught and passed from around 50 - 120 miles that deff went out too quick. Above all dont panic....