What the book says is: it should take a short time for harm after 9:00 to get worse, but a long time for harm before 6:00 to heal.
I usually heal 1 segment per session, unless (a) significant time passes within a session, in which case I heal 1 segment then too, or (b) no time passes between sessions, in which case I hold off healing.
Rose had to walk with a cane for, what, 4 sessions after the helicopter crash? I think so, I think I let him heal 1 segment every other session. He's kept the cane as an affectation.
-Vincent