Sypha mmmmmms pensively. All enchantments have a counter, it's just that some are fiddly or excessively specific. Geralt doesn't seem like the sort to spill details, but perhaps someone else who spent time in Thorne might be able to describe the effect?

"Do you know what caused it to drop?" she leans around him and plucks a sweet roll off a tray. "It may be over, but it could be cast again. Or the Free Cities might have picked up some tricks from Thorne during the Summit."