Based on route, I can cover 2, 7, 10 or 20 miles each way commuting to work. Which way I take going in depends on how early I throw a leg over the bike in the morning, coming home I generally opt for the 20 if time allows.

So far I have been lucky I that all my commuting flats have been on the way home. There have been many times however that going TO work in the morning I have left myself barely enough time to get to work on time for the route I chose, which is bad on account of I'm a teacher. I figure what I really need to do is leave myself an extra thirty minutes time to get to work in case of a flat.

I'm curious how other folks deal with this issue.

Mike