r</a></li>
      <li><a href="dart-core/Duration/microsecondsPerMillisecond-constant.html">microsecondsPerMillisecond</a></li>
      <li><a href="dart-core/Duration/microsecondsPerMinute-constant.html">microsecondsPerMinute</a></li>
      <li><a href="dart-core/Duration/microsecondsPerSecond-constant.html">microsecondsPerSecond</a></li>
      <li><a href="dart-core/Duration/millisecondsPerDay-constant.html">millisecondsPerDay</a></li>
      <li><a href="dart-core/Duration/millisecondsPerHour-constant.html">