Loop Path in After Effects

Cat’s tail on the preview is an animated path and I’ll show you how to loop it.
How to loop a path in After Effects?
Alt-click on the Path property and paste an expression below.

// if you don't need pingpong - false

pingPong = false;

try{

// start - first keyframe

timeStart = thisProperty.key(1).time;

// count duration

duration = thisProperty.key(thisProperty.numKeys).time - timeStart;