I used to do a 5 mile commute. I didn’t have to deal with any major elevation changes, and it was about 35 minutes. Maybe a professional athlete could do it in

I used to do a 5 mile commute. I didn’t have to deal with any major elevation changes, and it was about 35 minutes. Maybe a professional athlete could do it in 20, but they would still have to wait at stoplights occasionally. You will definitely arrive sweaty unless you are in a very cold climate. All that said, I consider 5 miles to be pretty reasonable for a bike commute.