Chris Solinsky runs 100-120 mpw at 5:45 being his "easy pace".
That's 575-690 minutes a week. Of course, that's if all of those miles were run "easy". It's safe to assume at least 20% of that mileage is quicker than his easy pace, making his load for the week more like 525-630.
For your average Joe D3 Post-grad like me trying to get back under 16, most of my runs are more in the 6:50-7:00 pace for an "easy day".
7:00/5:45 = 1.217.
So for my training to be equivalent to Solinsky's, I should run 1 mile for every 1.217 of his. His 100-120 mpw equals 82-98 mpw.
Furthermore, all of this is assuming that I want/can train at a relative intensity as America's greatest distance runner.
This is what I've been thinking about on my runs lately. It has nothing to do with being too lazy to put in 100-120 mile weeks, it's just seems like every runner I've ever known in high school and college always thinks the best way to get to the level of elite runners is to match their mpw even if it's at a slower pace. So you have 16:00 5K guys running 120 weeks, which would be like Solinsky running 145 mpw. There's no way we would be achieving our potential training that much. Unless the goal is only to run for as long a time as possible, we should concentrate on being the best 5K/10K runners we can.
In short:
18:00 5K runners should probably not run more than 65 mpw
17:00 5K runners should probably not run more than 75 mpw
16:00 5K runners should probably not run more than 80 mpw