Oh, about this ^ : WRONG. There are a few great easily accessible practice places INSIDE the city (e.g. check out Kenilworth Access)
I was meaning more than 4 hrs of riding in the city wouldn't be the greatest, but no doubt there are some great roads in the city. Is Kenilworth Access the one from the top of the mountain beginning at Upper Ottawa street? If so, that is an awesome few hairpin turns and a sweet view of the city.