*
   * @since 22.0 (but only since 33.4.0 in the Android flavor)
   */
  @J2ktIncompatible
  @GwtIncompatible
  @J2ObjCIncompatible
  public Duration elapsed() {
    return Duration.ofNanos(elapsedNanos());
  }

  /** Returns a string representation of the current elapsed time. */
  @Override
  public String toString() {
    long nanos = elapsedNanos();

    TimeUnit unit = chooseUnit(nanos);