I drive about 12 miles each way. It's not too bad. Most days those 12 miles take around 14 - 20 minutes, depending on what time I leave. If I leave during rush hour, those 12 miles can take over an hour. :-(
This is why I work 7 - 3:30. An hour before any of the mess.
No idea how many miles that is, but - 30 km from my home to the office.
I'd say about 7 or 8 one way. It's amazing how the drive in and back becomes so monotonous that you to work and realize you don't remember driving in.