[Johnny555]

It is not length but how secure you feel and how fast you can peddle.

It's also how dirty/sweaty you get on the ride. In the USA, bike showers are a rare amenity from employers.

My last employer said they had showers for bikers, which seemed like a great amenity, until I actually looked at them -- the shower room was down a little used utility corridor that was only unlocked during 8-6pm business hours, so if you got to work before or after that time you couldn't get in. There were no lockers, so you couldn't even leave a wet towel there for the day, you had to take it up to your desk.

I had a 14 mile ride to work, 90% on a separated bike trail so it was a great commute, but I rarely rode to work due to the poor bike shower situation since after an hour's ride I definitely needed a shower before work. But I was lucky enough to be able to share a drive in to the city with my wife on most days, then I'd bike home since I usually left work later than her.