Thundering Infusion Duration?

[Drake Brimstone]

The Kineticist infusion Thundering says it Deafens, but doesn't say for how long. Would it be one round? Permanent?

This came up in a game last night, the first time I played my Aerokineticist after the release of the book, and I Deafened a Div. Fortunately the GM just said it was probably Deafened for the rest of it's life. (It died the next round.)

[Imbicatus]

I'd say permanent. After, that's what blindness/deafness does, and it's only a level 2 spell.