Human readable duration format

gistfile1.js

var formatDuration = function(duration){
  var result = '', 
  tempTime =0, 
  durations = [
  { description : 'year', plural: "years", range : 31536000 },
  { description : 'day', plural: "days", range : 86400 },
  { description : 'hour', plural: "hours", range : 3600 },
  { description : 'minute', plural: "minutes", range : 60 },
  { description : 'second', plural: "seconds", range : 1 }
  ];
  if (duration === 0) 
    { return 'now';};
  result = durations.reduce(function(prev, current){
    if (duration >= current.range) {
      tempTime = parseInt(duration/current.range);
      duration -= (tempTime *current.range);
      prev += ' ' + tempTime + ' ' + (tempTime > 1 ? current.plural : current.description) + ',';
    };
    return prev;
  },0);

  result = result.slice(2, result.length -1); //Ignore the first two position and pop the last ,
  //Check if more than one , were inserted, then we need to 
  //replace the last one for a 'and'
  if (result.split(',').length > 1) {
    var lastComma = result.lastIndexOf(',');
    result = result.slice(0,lastComma) + ' and' + result.slice(lastComma+1);
  };
  return result;
};