I try to run 4-5 days a week, and sign up for at least 2-3 marathons/half marathons a year to stay motivated. I too have a horrible commute, but that can be changed by moving (in the process of). I end up running from 4:30 to 5:30, and afterwards will tend to go to the gym to focus on non cardio things.

I will say I reserve my long 8+ mile runs for the weekends as there isn't enough sunlight to do that on the work week. Having a Garmin was the best life decision I have ever made as it comes to running, because I have these challenges with friends and it is a fun way to stay motivated and competitive for our monthly goals.