80% of the time I'm going at a pretty fast-ish pace, maintaining 20-22 mph. Days like today (Mondays), I go slower between 14-16 mph. My work does have a shower fortunately.
Often times when there's no bike lane I'll hit sprints to maintain pace with city traffic around 25-30 mph between lights so the angry drivers here don't freak out that a bike is holding them up.