I just started commuting by bike this year. I have a 22 mile one way commute. It now takes me about 1 hour 20 minutes each way. When I drove, it took from 45 minutes to 1 hour each way. When I drove I used to work out for one hour (riding a bike or running). So, time wise it is now a wash for me (if you add commute time plus workout time) but I now get close to 3 hours of exercise per day. When I first started it was a bit of a strain. But now it is nothing. One caveat. You need to work into it. I started with one or two days a week and worked up from there over several months.