Similar hours, although I'd be willing to bet that Canadians do more, 'cause they have to with all the shortage of physicians and health care workers.
A friend of mine (internal medicine residency) just did two days in a row..... thats 48+ hours!!!!!!!!!! he's in his second year of res.
It is a good idea to do meds in canada and go to the US because med school here is cheaper, its in canadian dollars as well. HOWEVER, good luck getting in, especially if you are foreign, its brutally competitive!!