I got conflicting or incomplete responses from various sources:

There is an internal rate monitor looking to see the stabilizer is actually moving .08°/sec or -08°/sec.

https://forums.tfdidesign.com/index.php?/topic/2509-bbetty-stabilizer-motion-warning/

The trim horn will sound each 1/2 degree of constant pilot use, but the stabilizer motion call will sound when the auto pilot moves the trim 2 degrees within 30 seconds.

https://forums.x-plane.org/index.php?/forums/topic/123539-cockpit-sounds/

The CAWS will provide an aural warning (tone and voice) when the horizontal stabilizer deviates one degree or more for a given length of time. The warning will be on until the horizontal stabilizer sensor goes off.

https://www.airliners.net/forum/viewtopic.php?t=751253

Which one is correct?