Feather Token Whip. How long does it dance?

[Maryring]

A Dancing weapon can "dance" for a total of 4 rounds before it fall to the ground, but what about a feather token whip? I assume that it is the same for that whip, but I don't know... is there any official rulings on this I have missed?

[ken-do-nim]

The bigger question for me is does it do lethal or nonlethal damage.

I think it dances for the full hour.