I don't factor shower time into my cycle commute, because if I drive or take the bus, I'll shower before I leave home; when cycling, I shower at work. Same routine, just in a different order. When comparing the different ways of getting to work, I look at the time from when the alarm goes off to the time I walk into the office. During the summer, cycling vs. driving vs. public transit are all very close. Not that I did much cycling last winter, but I did notice my cycling time go up as the weather got colder, and especially when I had to ride on snow. That was one reason I decided to hang up the bike and take the bus instead.

In terms of specific numbers, summertime cycle commute is about 75-80 minutes per day (round trip), and wintertime was up to 95 minutes per day.