I always save old mainsheets for future use as righting lines for the homemade Hawaiian system.
I was going to guess somewhere around 14 to 17 feet for each side.
This allows enough length to tie the knots in the line, one stopper for fully deployed and one for the relaxed position. A large eyestrap riveted to the front side of the forward pylon is what your knots stop against.
Tie a pair of old jib clew blocks to your tramp lacing center aft, run a bungee through one and forward through one simple block tied to your center tramp lacing at the mast base, then back through the other aft block and tie off to the other sides line.
You can adjust the tension (or compensate for length) by varying the length of the return bungee under the tramp, and/or your smaller attachment lines to the stern deck lip (as described in an earlier post).
The righting line becomes a chicken line to keep your crew on board when you bury the leeward bow on a screaming reach

Crew holds on to the righting line with their rear hand to keep from making a trip around the forestay.
