$(document).ready(function() {

  var $enterTime = $('.js-time-interview');
  var sum = 0;

  for (var i = 0; i < $enterTime.length; i++) {
    var valueArr = $enterTime[i].value.split(':').map((item) => {
      return +item;
    });

    sum += (valueArr[0] * 60 + valueArr[1]) * 60;
  }

  console.log(sum);

});

$(document).ready(function() {

  var $enterTime = $('.js-time-interview');

  var sum = [].reduce.call($enterTime, (prev, input) => {

    var valueArr = input.value.split(':').map((item) => {
      return +item;
    });

    return prev += (valueArr[0] * 60 + valueArr[1]) * 60;

  }, 0)

  console.log(sum);

});

$(document).ready(function() {

  var sum = 0;

  $('.js-time-interview').each(function(){
    var valueArr = $(this).val().split(':').map((item) => {
      return +item;
    });

    sum += (valueArr[0] * 60 + valueArr[1]) * 60;
  });

  console.log(sum);

});