I wouldn't worry about it too much. In my younger days a college skydiving team used to come to my rural home town to jump. A lot. I hung out at the airport all weekend, watching them repack their chutes after each jump. Their canopies were former GI, the fancy ones of today hadn't been invented yet. I have no idea how many jumps were on each chute, but there were a lot. The lines are doubled back over and over again as they are packed in the pack, and I never heard of, or saw a problem with, any of the lines...
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OBG