5/6 = 0.83333..... =83% , the most-mentioned starting point for ratio of length of the hammock over its arc and the distance between points of a real or virtual ridge line.
Many of us hang our Clarks tighter than what will likely deliver most comfort. I wrote likely.
No harm in measuring.
I used a ridge line with a Clark for awhile, one that had extensions out to points to which I attached the ridge line. The extensions were 16" out there so that the outer ends of them, where I attached the ridge line, could be UP there, above the hoops. With an 96" Clark, the overall length was 96 + 16 + 16 = 128, and the ridge line, a whoopie sling, was set to around 105".
At first that seemed like a lot of sag. Then I realized how much more comfortably I could rest on my side with a knee up, or on my back in diagonal.