I don't think it does, however the stronger the energy input the leas they can use it for example against zamsu he used final kamehameha in ssjb and unfused instantly

Search it up🧐

I wonder if potara uses up their energy

Lol imagine when vegitos time runs out but it's not like the fight will last thirty minutes... Right?

Oh ye earrings do run out early cause of the energy they put out though but fusion goes the whole 30 minutes