The following animation types are the only ones that have a predictable duration.
|Animation Type||Duration in Seconds|
"slow fly" is triggered when you start to move forward, during the transition between hover and fly animations. "prefly" would have been a clearer, and more consistent, name. This information might come to a surprise to people expecting slow fly to be another form of movement.
This information is important for avoiding creating animations that will be cut off early, or run longer than the action takes.