I give a lot of credit to the person or persons that would attempt to commute 2 hours (30-40miles or more) each way. Chances are that they would be commuting in the dark in both directions, which would mean having more battery capacity than 2 hours and recharging abilities at both work and home. And the lights would have to be pretty bright for the speeds over 20mph. I use a Nighthawk Dual Pro 10w/20w halogen headlight and find that the 10w is insufficient at the speeds I travel, even with the single 20w light I still occasionally miss seeing potholes and road irregulaties. Using the 20w only give me 1hour which is more than enough time for my 13 mile commute home, wish I had more battery capacity and lighting power. If I run the full 30watts I'd be cutting it close with the battery (supposedly 35 minutes at 30 watts) for my commute.