<p>I only sent one to a professor in U of Toronto and that’s mainly because I’m required to do so as a non-Canadian applicant. (International applicants need to secure a sponsorship before they can submit their applications). I thought it’s gonna take forever and it would be very hard to find a professor who is willing to sponsor my application. Surprisingly, I got a super quick and positive response from the first professor whom I contacted, despite his big name. It seems that I need to add U of Toronto to my school list now.</p>