Depends on what you do with the tail. If you tie it to the aft end of the hiking strap (which I recommend), then 13.5 metres is perfect. If you tie it to the forward end (not as good) or just tie a stopper knot (not recommended), then you need a little less. Cut to 13.5 m and see how it works. The boom should go just past 90° when you let it all out.
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