Well:

If I drive on the weekend (which I do if there is something emergent I forgot) it takes 15 min. + 30 s. to park in the 15 min. loading zone.

Most times that I drive on a weekday it takes 15 min. + 15-20 min. to find/pay/walk from parking.

The bike ride is a pretty consistent 45 minutes, although If I goof off downtown or get distracted by something shiny on the bike path it'll baloon to an hour.

However: the last dozen times I've driven (over the last year) I have run into traffic/accidents/construction/state fairs/ conventions etc... and it ended up being over an hour door to door.

I don't know if that stuff happens every day to the drivers where I work, but what are the odds that the dozen days out of 260 that I drive are the only ones that have traffic snarls?