var time = 0,
    games = document.querySelectorAll(".gameListRow h5"),
    text;
for (var i = 0, len = games.length; i < len; i++) {
  text = games[i].innerHTML;
  if(text != "") {
    time += parseFloat(text.replace(",", "").split(" ")[0]);
  }
}
console.log(time);