[BaHalus]

Hmmm... Yes, it should be clearer. One try per subject, per subject per mage, per subject per month, per mage per month, etc.

Edit.: But, looking again, I don't see any spell that restricts a subject to only receive tries from one mage. Even great healing only says that the subject can't benefit from more than one, but says nothing forbiding a second mage to try if the first one fails.