code: function fmtLong(ms) {
    var msAbs = Math.abs(ms);
    if (msAbs >= d) {
      return plural(ms, msAbs, d, 'day');
    }
    if (msAbs >= h) {
      return plural(ms, msAbs, h, 'hour');
    }
    if (msAbs >= m) {
      return plural(ms, msAbs, m, 'minute');
    }
    if (msAbs >= s) {
      return plural(ms, msAbs, s, 'second');
    }
    return ms + ' ms';
  }
docs: Long format for `ms`.
  
  @param {Number} ms
  @return {String}
  @api private