I cant speak for collegiate athletes as I only started running seriously in my 2nd-3rd years of medical school. By 4th year was running 100 mile weeks. If it wasn't for the running I never would have survived it, it's a great mental "flush" at the end of the day and puts things back into perspective. Ran all my PB's after med school while working as a doctor (still running PB's on the track as a surgical trainee). It can all be done if it's what you really want. You just ahve to be a bit selfish with your time.
Like the poster above I use it as a commute, run 5 miles to work, 10 miles home, work outs when I have the energy during the week and on a saturday (when I have less tha 15hrs of work), long runs on a sunday (often before going in for a round).