Well, there's exactly half a second between shots. One interesting combination you might like is pairing it with a Sniper Rifle with Armor Piercing Rounds. They penetrate through all cover, no matter how thick, so long as it is one continuous object. Once they hide behind cover after getting shot once by Timur's Lash, one shot anywhere to the body through their cover will kill them. Results vary depending on what cover is available but it works great if they hide behind some boxes, a rock, a pillar, etcetera.