The reference time inside Spine is 0.0166.
This is the value of (1.0sec / 60frame).
http://ugken.com/ext/Spine/AnimationTime.zip
*Updated.
In addition, it is possible to obtain events at specific times.
3 of the included sample file (Motion event), there is a sample of a function that can catch specific events when they occur during an animation.
I am not sure about specific animation freezes.
If you have reproducible data, I would appreciate it.