Matt, have you never thought of pursuing a hobby or another line of work on your 'days off'.
It's interesting to see the various reasons why people start window cleaning, but one of the things that attracted me was the cash flow and flexibility. Without knocking all the long-serving shiners, I don't want to be window cleaning in 20 years time ... but while I'm fit and able it's great way to make a living and gives me enough time to pursue other interests.
Oh, and I get to see the missus more, which is a BONUS!!