Days later. A week. Two. I don’t know. After Denny’s deflation, time meant little to me; he looked sickly, he had no energy, no life force, and so neither did I. At a point when my hips still bothered me––not so long as to have healed [i], not so soon that the pain was acute [ii]––we went to visit Mike and Tony. (Garth Stein, The Art of Racing in the Rain)
It seems like the first negation is applied on to so long (partially); the second on to so soon that the pain was acute (wholly). Is my guessing right or am I to see other ways? If mine is okay, what factor causes the difference?