For a reference point, hull speed for a 30 foot boat is about 9mph ->so over 3 hours for the trip.? At hull speed a very conventional electric boat could have the range at a very reasonable price.? It could go much faster, but battery cost for range would go up exponentially.? The trip could be far more pleasant, quiet, autonomous, and air conditioned.
Greater weight linearly increases the power and energy required.? Consider speed greater than hull speed to increase cost exponentially.