Q
While The unsuitable rally is over.
was in my set zone C, my opponent set an area enchant card.
How is my opponent's area enchant card resolved?
A
After its clock counts at the start of the turn, it's put in the power charger or abyss immediately.
This lasts until The unsuitable rally is over. leaves your set zone C.
It ends 1. when you set a different area enchant card, 2. at the end of a turn your opponent put a card in the abyss, or 3. when your opponent uses an effect that affects area enchant cards.