Duration of a Dragon's Frightful Presnce

I know this may have been asked and answered before but I am not able to find an answer.

On a Gargantuan Blue Dragon - Frightful Presence 330 FT & DC 28 - what would be the Duration of the effect and for dragons, would the effect be frightened or something else?

This is for an Adventure Path dragon.

The default duration is 5d6 rounds. It is under the universal monster rules.

I know this may have been asked and answered before but I am not able to find an answer.

On a Gargantuan Blue Dragon - Frightful Presence 330 FT & DC 28 - what would be the Duration of the effect and for dragons, would the effect be frightened or something else?

This is for an Adventure Path dragon.

Funnily enough, I was looking for the same issue the other night, and I had a devil of a job finding it. Quite posibly for the same reason.

_
glass.