I couldn't notice this increased duration on clone. In fact, it seems to stay on the screen for less time to me sometimes. I remember Noob players constantly getting hit by it after the rolled out of their teleport, but nowdays this rarely happens, and only happens on the corner when it does. Most of the time the clone shatters right when Noob rolls. Or I might be fighting better players now who time/space their attacks better, idk.
But I really couldn't notice, doubt it's more than 5 frames.