roar strike at <person> approximately lasted 40 seconds

roared wail, and strike at person from missile range for data purposes.

Here, just tried it again on random critters I'm backtraining with timestamps. Unedited log.

*****************

(4:54:24 EST by my clock)

>bers cy
Fury storming forth, your pulse whips itself up to a furious tempo!
>
* Ineptly, a dobek moruryn claws at you. You partially block with a damite skirmisher's shield.
[You're winded, solidly balanced with opponent in good position.]
>
* As if effort and skill were a bad thing, a dobek moruryn whips at you. You partially block with a damite skirmisher's shield.
[You're winded, solidly balanced and have slight advantage.]
>roar quiet wail
>
The technique of the Banshee's Wail flows fluidly through your mind an instant before you unleash its power through a roar of fatal intent.
A dobek moruryn appears to be frozen with fear!
A dobek moruryn appears to be frozen with fear!
A dobek moruryn appears to be frozen with fear!
Roundtime: 2 sec.
R>scream face
Scream at what?
>scream helm
A feral scream rips from your lungs and shakes your steel helm to trembling. You feel terrifying.
Roundtime: 2 seconds.
R>
You feel fully rested.
>roar quiet kun
>
A stinging sensation tears at your eyes as a painful reminder of training with this roar. You focus on the inspirational power of Kuniyo to stagger your enemies and unleash an execrable sound from deep within!
A dobek moruryn appears terrified and staggers back!
A dobek moruryn appears terrified and staggers back!
A dobek moruryn appears terrified and staggers back!
Roundtime: 3 sec.
R>
You feel somewhat less terrifying.
>
You feel your inner fire cool as you finish practicing the Form of the Swan.
>
You feel your inner fire cool as you finish practicing the Form of the Piranha.
>
You lose control, and the cyclone of fury drifts away!
>
You feel your inner fire cool as you finish practicing the Form of the Dragon.
>bers stop cy
Maybe try berserking first?
>form dra
You slowly center yourself, your mind growing quiet as a quickly building rage surges through your body, your limbs quaking with its boundless strength. A terrible roar of fury and bloodlust rips from your throat as the Form of the Dragon consumes you, only a thread of control fighting back the descent into a berserker's madness.
Roundtime: 2 sec.
R>form swan
With the nimble grace of a swan, you maneuver against the very integrity of mana.
Roundtime: 2 sec.
R>form pira
Your movements begin to mimic the rapid rythm of the piranha.
Roundtime: 2 sec.
R>l
[Cavern of Glass, Eylhaar's Grotto]
An almost eerie quiet fills this part of the cavern. No sounds seem to filter through except for the occasional echo of a footstep nearby. Carved images in the cavern walls depict scenes of death in a more natural state. You also see a dobek moruryn that appears immobilized, a dobek moruryn that appears immobilized and a dobek moruryn that appears immobilized.
Obvious exits: southwest, northwest.
R>ass
You assess your combat situation...

You (solidly balanced) are facing a dobek moruryn (3) at melee range.
A dobek moruryn (1: immobile and solidly balanced) is behind you at melee range.
A dobek moruryn (2: immobile and solidly balanced) is flanking you at melee range.
A dobek moruryn (3: immobile and solidly balanced) is facing you at melee range.

(You are also defending against a dobek moruryn.)
>
* Arnau was just struck down!
>
A dobek moruryn skitters into view, stinger poised.
>
A dobek moruryn waves its claws in a peculiar parody of sign language.
>ass
You assess your combat situation...

You (solidly balanced) are facing a dobek moruryn (3) at melee range.
A dobek moruryn (1: immobile and solidly balanced) is behind you at melee range.
A dobek moruryn (2: immobile and solidly balanced) is flanking you at melee range.
A dobek moruryn (3: immobile and solidly balanced) is facing you at melee range.

(You are also defending against a dobek moruryn.)
>
The dobek moruryn begins to advance on you!
The dobek moruryn advances from nearby and is closing steadily.
>
The dobek moruryn closes to melee range on you!
>
* Moving in like a timid schoolboy, a dobek moruryn whips at you. You partially block with a damite skirmisher's shield.
[You're solidly balanced with no advantage.]
>ass
You assess your combat situation...

You (solidly balanced) are facing a dobek moruryn (3) at melee range.
A dobek moruryn (1: immobile and solidly balanced) is behind you at melee range.
A dobek moruryn (2: immobile and solidly balanced) is flanking you at melee range.
A dobek moruryn (3: immobile and solidly balanced) is facing you at melee range.
A dobek moruryn (4: solidly balanced) is behind you at melee range.

(You are also defending against a dobek moruryn.)
>
A dobek moruryn lurches forward to stab a pointed stinger at you!
The dobek moruryn's stinger lashes at you. You quickly step aside.
[You're solidly balanced and have slight advantage.]
>face fourth mor
You turn to face a dobek moruryn, leaving the dobek moruryn on your flank at melee!
>roar wail
The technique of the Banshee's Wail flows fluidly through your mind an instant before you unleash its power through a roar of fatal intent.
A dobek moruryn appears to be frozen with fear!
Roundtime: 2 sec.
R>
A dobek moruryn growls and shakes off the fear that was holding it frozen.
>
A dobek moruryn growls and shakes off the fear that was holding it frozen.
>
A dobek moruryn growls and shakes off the fear that was holding it frozen.
>
A dobek moruryn growls and shakes off the fear that was holding it frozen.

(4:57:09 EST)

**********

tl ; dr Threw in my roar helm and cyclone berserk and got almost a three minute immobilize when underhunting and using ROAR QUIET.