I've never actually timed the LBs, I think the healer's is instant, tanks is also fast (the point at which they can move again after casting it), but it really feels like "lemme take my good old time lugging out my crossbow and fixing my posture"

LOL @ getting invulnerability in feast when the healer dies. A good healer can really make or break a match. At least we're not so reliant on healers as much with the medical kits.