I am curious for a definite answer also. I've been living in Canada for 15 years but never exchanged my NY license because I don't drive here. Now I am considering getting a car hence looking into exchanging my license.
I believe the 60-day rule is that after 60-days of arriving, you must exchange your license if you wish to continue to drive in Ontario. But I am not 100% sure.
In Alberta I drove with my mexican and an International driving licence, for 1 year. I guess you need to go to a licence office and ask.
The international driver licence is easy to get online.
For people of the USA is easy, is only an exchange due to an international agreement.