Lenny Leonard wrote:
Yeah, you could run it off of 20 miles a week if you did it right.
Absolutely, my 17 yo son ran an 18:50 5k last summer and he's never run more than 20 miles/week in his life.
Yes, it is possible.
In HS I was terribly undertrained, ran XC my last year only, never having done over 15 mpw before. Went from 19:30ish to 17:45 on 25mpw with no summer mileage.
If you do it right (reasonable mix of easy days, long repeats, and short repeats) I'd guess you can probably do it.
16 weeks is a good amount of time. Try to stay consistent and keep your easy days easy and hard days hard. 55mpw might even be a little much depending on natural talent.