Yup, 7 feet sounds right. The shockcord doesn't actually attach directly beneath the handles - they pass through eyelets directly beneath the handles, then run along the side of the pontoon under the hull lip. The crew's trap stretch cord runs forward, skipper's stretch cord runs back. After 7-8 feet or so, they are tied off at eye-straps under the hull lip. Look at your boat, and you'll see the four eyelets right on either side of the shroud anchors. The front eye straps are a few feet back from the bows, and the rears are about a foot in front of each transom.
Conesus Lake, NY
1976 Hobie 14