Morning commute is between 13.5-26 miles depending on my mood and work load. Evening commute is 6.5 miles and the straightest shot from work to my house.
I ride a 6 lane divided road for ~3 miles. The posted speed limit is 45 MPH. However, average speeds are usually 55-60 mph. There is a dedicated bike lane the entire way, but my morning commute can get sketchy as I pass a dunkin donuts (cranky java deprived people don't like waiting on a bike) and Walmart (early morning tractor trailer deliveries can be interesting).
Once I get off the main road, it's all 2 to 4 lane roads with minimal traffic and a dedicated bike lane. I pass a fair share of roadies out training and get some funny looks....I ride a cross bike with knobby tires and a set of panniers.
Overall, I ride ~60-120 miles a week.