What's your fitness level like now?

If you average 19.5 mph, you'll be riding non-stop for 2 hours, which it quite a lot if your fitness isn't already quite high. Adding cleaning and prep on each end makes this a 2.5-2.75 hour/day activity, which is a huge amount.

Even averaging 19.5mph (total not rolling) is quite difficult unless you're in a rural area with no lights/traffic.