FWIW, IME the work ethic in Canada is very, very similar to what it is in the US. There's certainly an accent on the notion of "going the extra mile" by sacrificing a weekend here and there for the sake of a project that's in danger of not meeting an arbitrary, crazy deadline.
It seems amazing and a little sad how so many smart people can collectively be so deluded and piss away their health and, ultimately, years of life down the drain in order to make the boss happy/earn that promotion, etc..
There's nothing like being on a conference call with a bunch of smart folks, some of whom are having trouble keeping a short meeting agenda in their heads for 30 minutes due to being profoundly burned out.