for example: I have a route that I ride for about 4.5 miles to get to my office and on the way back its about 4 miles (different way)... so I am used to that distance but if I go another route, I could increase my commute to about 12 to 15 miles. Im not sure I could do that without some intermediate steps. so I was wondering if anybody used strategies to build up to a longer distance while on the commute. like: does one try to increase the mileage a certain per cent per day, does one increase every other day? etc....