I commute on my '72 Cilo Pacer. I also pick up my daughter from school after work most days. So, I wind up adding a Piccolo trail-a-bike for the first part of the commute, lock it up on my way into the office, then commute the rest of the way from Berkeley to my office in Oakland. Then on the way home, I grab the trailer, head up a small hill to my daughter's after care, then we ride the last 1.5 miles home together. Total round trip distance is about 16-18 miles depending on whether I'm also picking up and/or dropping off my daughter. From home to office, I've done it in 20 minutes (and was a sweaty mess), but it's usually closer to 25 minutes of bike time, plus another 5 minutes or so dealing with all the locks & stops.
If it's raining, I'll take my Nishiki Competition with fenders.