My friend (and beehive namesake) Kitty forwarded me an email from a Jon Freestone who has a robin nesting in an inconveneint spot.
Jon says: "The nest was built between a Saturday and a Wednesday (that is the day it was first noticed) It has been there for about two weeks now, figure I will leave it to just to see what happens."

I think we can get an idea of how often Jon uses this bike.