Well, the 35 hour week (or more accurately, 70 hours every 9 days) is a bit of a starting point. But it's a better starting point than most!

I really need to sleep on this (or at least toss and turn all night in this heat!), but I'll sneak a look at this thread again on my work PC before I break the news to my boss in the morning.

Thanks again to everyone for all the suggestions.