Did this last year, and I wasn't pushing it at all and had it done in 7 days, with quite a lot of stopping for pics.
From TO though I'm sure you have further to go. From London you just head up to the Sault thru Michigan.

North Shore in Canada was much more interesting, but also quite a bit more $$$ than travelling in the US.

You could check some of the pics in here.

http://www.gtamotorcycle.com/vbforum...rcumnavigation