Chime in and share:
A bit of description of your route profile.
Three times a week at least. Mostly 4 and 5.
Vienna VA to Washington Navy Yard (Southeast DC) one mile to WO&D trail, Custis trail, ride in to the national mall, Ride the mall from one end to the other then one more mile of road to the Navy Yard.
Works well as there are showers and Dry cleaning right around the corner. Total milage is 19.98 miles one way averaged so forgive me if I round to 20 miles one way.
Currently riding a Fuji cross comp (no pic at work), two small front panniers used on the back. One for computer, lunch and work related stuff, second for suit and clothing
Average around 1 hour 10 minutes, fastest done in 54 minutes, worst 2 hours 34 minutes in January (came down with the flu later that night)
I have found if I take the metro, drive during rush hour or ride in to the office, all options are within 15 minutes of eachother.