My full commute would be 17 miles each way. Tomorrow I'm driving to meet a co-worker part of the way there to cut that down to around 7 miles each way. We figure the first time we should be conservative to make sure we don't overdo it. I don't fear the first 17 miles but since I normally go a max of 15 in my evening rides the other 17 home may lay me up. So... tomorrow is 7 there and then 7 back. That doesn't exceed my daily miles now but I don't know what doing 7, working all day, and then doing 7 again will do. Well yest I do... it won't hurt me at all but what comes next is meeting further and further from work until I'm doing the full amount. That will be exciting.