You can go to Lake Ontario via the Trent Canal with mast down if you draft is no more than five feet. Going the Welland Route should take you 10 to 12 days at a relaxed pace. From Oswego, NY where you enter the canal is about 8 to 10 days, again not rushing but moving each day. It is a very pleasant trip.
In South Africa doing lots of boat stuff. Departure north from Cape Town around December 15th. Arrival in the Caribbean around the beginning of February, after 5300 miles or so.