autobump

var time = 3600000;
/*
3600000 - очин час
180000 - 3 мин
60000 = 1 мин
*/
var countAB = 0;

function autobump() {
  var randomTime = 0;

  while (randomTime < 60000) {
    randomTime = time * Math.round(Math.random()*100)/100;
  }

  console.group();
  console.log("interval bump: " + randomTime / 1000 / 60);

  setTimeout(function () {
    document.getElementById("shampoo").value = "bump №" + countAB;
    countAB++;
    document.getElementById("submit").click();

    console.log("time bump: " + new Date());
    console.groupEnd();

    autobump();
  }, randomTime);
}

autobump();