You can do it with less. You need a total bury of 5" plus 1" taper on one side.
So 2' for the loop and 6" for one bury and probably 2" for the other side.
24" + 6" + 2" = 32"
A double fisherman's will take up about 3" a knot and you need two.
So 24" + 3" + 3" = 32"
So for 2" you get a pretty good boost to strength.
The double fisherman's does not test well for strength retention, but we probably will not max it out either way in this application.
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