Ah! We could say, then, "spring length." The one pictured is 145 mm.
I have edited my previous posts where I mis-measured. So, for clarity (if we could hope for such a thing ), I'll say it this way:
The range of adjustment is about 30mm. The shock pictured is "preloaded" 18mm or 60% of the adjustment range. (Even if the adjusters are backed all the way off, I suspect the spring still has some "preload." I could not find any specification for this spring's free length.)
The angle of the photo does not show the threads below the adjustor ring, but there is another 12mm to maximum.
I am surprised with your weight and your spring length that you do not have more sag. Possible the PO already changed the spring?
(The stock coil wire is about 0.445" with 6 full coils)