All times are "door to door", leaving my apartment door and arriving at the office door to check in.

Driving - 8-15 minutes depending on traffic, Capitol security shenanigans, etc.
Biking - 7 minutes, give or take 30 seconds or so.
Walking - 20-22 minutes.

BTW, around here, anybody's commute can double in time elapsed due to traffic problems. Really, really sucks for those living a half hour away or more with clear traffic.