It s a line I rarely check ,but should ,but its been 1 year since I did change it .but I think because of the 2 90% angles it should be on the list for changing more often ,as I was 2 klms off shore today and it broke after a good stack I might add ,

,so floating around in 20-metre deep waters tying a knot with a dis connected sail with my legs hanging down was not my sense of fun ,luckily I leave the boom clamp string long as there was no way of budging the knot ,I was able to tie a knot in it to keep sailing for another sheepest hour wondering if I would need to fix it again ,not a good thought ,but it held on,
it's not a line I would change much ,but guess it sure does have a lot of pressure on it and the angle of the string would wear it more than a downhaul rope having such sharp 90 degree angle corners so it wore through but still looked ok from the outside so check your boom lines guys ,how often do you change the boom line.?
the knot that gave me 1 more hour sailing .

Phew ,ace of ?? spades .