queueTime.js

function queueTime(customers, n) {
  var sorted = customers.sort((a,b)=>b-a);
  var max = Math.max(...sorted);
  var tills = Array(n).fill(0);
  
  while(sorted.length>0){
    for(var i=0;i<n && i<sorted.length;i++)
    {
      tills[i] += sorted.shift();
    }
    tills = tills.sort((a,b)=>a-b);
  }
  return Math.max(...tills);
}