Duffy Electric Boat Rentals Duffy rentals offer a quiet boating experience. Easy to drive, the Duffy is recommended for boaters of all experience levels. An approximate cruising speed is 5 knots. Batteries hold a minimum charge of six hours. The Duffy is perfect for enjoying the harbor and its many sights or relaxing at the end of a busy day. 18' Duffy Electric Boat with Surrey Top Cruise the harbor in a Duffy with friends on a picnic. A great way to see all the sights. Comfortable seating. Surrey top provides shade. Includes stereo radio with iPod connection and dining table. Seats 8 - $75/hr or $130/2 hrs(partial enclosure) - $85/hr or $150/2 hrs(full enclosure) 21' Duffy Electric Boat with Full Enclosure Perfect for day and night time sunset cruises. Full eisenglass enclosures keep passengers toasty warm. Plush upholstery. Includes stereo radio with iPod connection and dining table. Seats 12