need a help on trim path animation

I wrote this code; you can edit the initial variables. (pathDuration and timeBreak)

I hope you have the same hierarchy as I do.

function framesToTime(frames) {
  return thisComp.frameDuration * frames;
}

var proj = app.project;
var thisComp = proj.activeItem;

// in seconds or use framesToTime(15) for 15 frames
var pathDuration = 5;
var timeBreak = .5;


if (!thisComp.selectedLayers.length) {
  alert('Select a shape layer');
}

app.beginUndoGroup("Undo");
var selectedLayer = thisComp.selectedLayers[0];
var currentTime = 0;

for (var i = 1; i <= selectedLayer.content.numProperties; i++) {
  var shapeGroup = selectedLayer.content.property(i).property("ADBE Vectors Group");
  var trimPath = shapeGroup.addProperty("ADBE Vector Filter - Trim");
  trimPath.property("ADBE Vector Trim End").setValueAtTime(currentTime, 0);
  trimPath.property("ADBE Vector Trim End").setValueAtTime(currentTime + pathDuration, 100);
  currentTime += pathDuration + timeBreak;
}

app.endUndoGroup();