How to have a (wait) yield on a for loop?

Well this works great, however there is a problem. If I press the screen, it counts it as many times as possible:

 for (var evt : Touch in Input.touches) {
 var HitTest0 = num0.HitTest(evt.position);
 }

Is there any way I could have it register only once per touch, or every few seconds?

Thanks, sorry for the poor explanation.