i start the path at Beechwood off of O'Connor and it takes about 2 hours to complete the loop. Its a great loop - mostly offroad and on excellent bike paths.
if there is anyone interested - it would be great to go out with others.
Looks like a decent route. I can likely meet you at the Don Mills portion of your route and do the loop with you until you reach the Lakeshore and DVP (I live downtown).
Give me a call when you get a chance at 905-330-5758 to figure out where exactly is best to meet as I'm unfamiliar with the route and will be following the Don Valley path until the meeting point.