def display_duration(value):
    """
    Maps a session requested duration from select index to 
    label."""
    map = {'0':'None',
           '1800':'30 Minutes',
           '3000':'50 Minutes',
           '3600':'1 Hour',
           '5400':'1.5 Hours',
           '6000':'100 Minutes',
           '7200':'2 Hours',
           '9000':'2.5 Hours'}
    return map[value]