How many doublings until n customers?

 1// Estimates how many growth cycles until we hit 'target' customers,
 2// when each cycle doubles. Returns the cycle count.
 3function cyclesUntil(target) {
 4  let count = 0;
 5  let n = 1;
 6  while (n < target) {
 7    n = n * 2;
 8    count++;
 9  }
10  return count;
11}