No stopping in between? No warming up and sit around just to charge the batteries?Huh? $10K in diesel fuel? That seems rather high. At $4 a gallon, that's about 2,500 gallons. Burning a gallon an hour at 5 knots gives you a range of about 12,500 miles. It is less than 2,000 miles from Montreal to Key West, Fl. That's about 400 hours at 5 knots, at 1 gph fuel cost will be about $1600 each way at $4 a gallon. A gallon a hour is a high burn rate, my boat burns about ¾ gallon an hour at 6 knots.
My friend went on a Hunter Legend 37.5 a while back. Diesel costed >$10,000.
Sir you calculation is based on straight flight line. Don't you go exploring? Sailing/motoring is never a straight line. What's the hurry?
If the only issue is cost, take a flight. Only a few hundred bucks.