I am at work 40 hours a week. I work on what is basically an internal programmer for hire service, and on a good week I might be able to bill 20 productive hour

I am at work 40 hours a week. I work on what is basically an internal programmer for hire service, and on a good week I might be able to bill 20 productive hours. I don't have a good measure of how much of that is due to idle (internet) time, but a lot of the productivity loss is from meetings, switching between small projects or chatting with co-workers. I spent a little time at Menlo (as a customer), where they do 100% pair programming. Being "on" and working >90% of the time takes some getting used to. The ability to just get up and walk around the building or the block when you want to is a nice perk.