If it normally takes a few days, you'll probably be fine here. Even times like this, when everybody is back to normal, never last more than three days tops.

What do you mean exactly with Mantra and transform though?

[Okay. Singing. Riz, for the record, doesn't sing. And if he did, absolutely nobody would be calmed down by it. It does make him wonder though if this Sera was some sort of bard. Bards had some calm emotions spells, right?]