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.
Finished the circumnavigation in early February in Grenada. Have to work on a book project for the next several months so the boat will be waiting for next year.