Last summer i worked part time 3 days a week and cycled 80km a day, two hours each way. Brilliant ride comprises 10km on roads and then 30km on trails each way. My current bike is an old Mongoose mountain bike, with slicks and I carry a backpack. I'm lucky my office has bike storage and showers etc.....
Looking forward to the new bike next year, either the 2010 Conquest classic or a trek Portland, I want to move onto drop bars and disc brakes.
Roll on next summer!