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8 at the most with Cataclysm, I think. Vs. that dragon in the Henne Mines.
I hate how it uses your MP though instead of a limit gauge like past games. Then I can't heal, which is pretty much why I just leave them for the final attack.
Imagine my horror when I only quickened a four against Mateus right before he would have used Blizzaja and it didn't kill him. >.<
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If Charge restores enough, you can do a quick charge on all three characters after, providing the boss is slow enough that you don't need a heal in between chargings.
I'm not sure how charge bases how much MP it restores though.