I'm very new to the game, just reached level 32 and got the summoner and scholar jobs. I want to be a main healer and the scholar looked like it was the perfect class for a noob, having a summon that auto-heals the party.

My issue with the fairy is that i can't really say when she will start healing. So, how much can i trust it to keep the party healed, and when should i step in to add my heal to it?