I can't see it ever stacking, and it says it only does static damage; the wiki says it stacks, but I've never seen an opponent with multiple stacks (of course I'm usually too distracted by catching axes to tell); so does anyone know for sure, and how many times it can actually stack??

I don't believe it stacks, so the wiki is wrong in this case. it does reset however, and the enemy will continue to "bleed" the full amount every time Draven crits OR lands spinning blades.