Check IF statment every X seconds and then run the code once

I am looking for a way to check the IF statement every 1 second,

var vid = document.getElementById("video");
var cTime = vid.currentTime;
if ( cTime > 5 && cTime < 10) {
}

and once it is met, then run the code

  vid.currentTime = 15

I have tried setInterval method but assume that it is memory leak. The other thing I tried is

var vid = document.getElementById("video");
var cTime = vid.currentTime;
function skip() {
  if (cTime > 5 && cTime < 10) {
    vid.currentTime = 15
  }
  setTimeout(skip, 1000);
}

but it keeps on firing the currentTime to 15. I might have multiple if statements in the future. What is the best way to do it?