How long can you safely leave a permanent slackline set up?

How safe is your webbing if you permanently leave it set up. Wade Desai and Marshall Leaver from Steel City Slackers have a perma-line up in west virginia and when they replaced the webbing, Wade sent it to me and I tested it. It had a segment connection in the middle, it was up for 2 full seasons, I tested the sewn loops and the most used parts of the webbing. Until I finish the website with the new blog system, here are the results:
FYI: In all samples, the webbing broke in the back of the weblock
#1 - Backup 17.32kN
#2 - Backup 17.34kN
#3 - Backup 13.37kN!?!?!
#4 - Backup 20.64kN
#5 - Untensioned main line 20.53kN
#6 - Main Line 20.42kN
#7 - Main Line 17.82kN
#8 - Main Line 18.44kN
#9 - Main - part in weblock 20.26kN
#10 - Main - most used part 20.31kN

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What we are
00:43 - Wade shares the details
04:18 - Backup webbing tests
07:05 - Main line tests
10:50 - Balance Community's Latest Gear
14:42 - Spider Slackline's Latest Gear