It is about 4.5 miles between my house and my office. In a car with no traffic, I can do it in about 7-8 minutes, more typically 10-12. On my 1975-model 10-speed Iverson with 27" street wheels, it took me 22 minutes, plus a brief break at the front gate to pick up schwag. I borrowed a helmet from David.
Of course, later today after lunch I have to bike home so that I can then drive patgreene to a medical appointment... (wry grin).