I get asked that question quite often in reference to the amount of mileage my training consists of. Personally, I am a believer in low-mileage/quality training, instead of the 100+ mile weeks that some people feel is necessary to complete longer ultras. My weekly total is surprisingly very low — it’s probably on the average of about 40 miles. I really don’t know exactly, since I log hours, and don’t keep track of the distance. I also don’t run everyday or do back-to-back long runs on weekends — I take at least 2 days off a week when I don’t do anything other than lift a pint glass to my mouth.
As proof that this works for others besides me, check out page 70 of the Feb Runner’s World — Tim Twietmeyer averaged 54 miles/week in 1996 when he won Western States in a time of 17:42. His longest run were some 50 mile races, and he doesn’t do back-to-back long runs either.