Frightful presence duracy

[Kazumalice]

Hi there

I have a question about the duration of Frightful Presence effect ? It's an aura, so for me it remains the time the monster stay in range. But for others, the Frightened is reduced at end of each turn.

What's the good way to use ?

[HammerJack]

Frightful presence says "Regardless of the result of the saving throw, the creature is temporarily immune to this monster’s Frightful Presence for 1 minute."

So after the save is made, the Frightened conditions go down normally at the end of each turn. The aura isn't continuing to apply new frightened conditions to targets that are immune.