def od_to_ms_300(od):
    """Convert an overall difficulty value into milliseconds to hit an object at
    maximum accuracy.

    Parameters
    ----------
    od : float
        The overall difficulty.

    Returns
    -------
    ms : float
        The number of milliseconds to hit an object at maximum accuracy.

    See Also
    --------
    :func:`slider.mod.ms_300_to_od`
    """
    return 79.5 - 6 * od
