What's your average commute?

And how long do you think it is too long? London has a particularly high average commute. If you have to go 3 days a week to the office and spend 60' each way, you will spend around 10 days each year on commute. I'm lucky I walk to the office or most meeting places and I count it as part of my workout. But my wife is considering a job offer and I'm not sure how to measure it in a sort of objective way (money is similar to her current position, but the hours are better, in theory). What are your thoughts?