Back a couple years ago, I was doing an 18mi commute each way about three times a week. It was worth the time for me, but then again I didn't have kids. My partner understood the need I had to ride, and was happy with the decrease in car-related costs. I'd say it depends on what you think is worth it. Additionally, you could always drive in one day, ride home then ride in the next day and drive home to save some time.