Hi @jsnull,

At the moment Calendar Plugin doesn't support showing the end time (hour and minutes) for the single-day events. I would suggest making an annotation in the event title if you want to make the user aware of an event duration:

{
    title: 'Meeting, 10:30 - 12:30',
    description: 'description for Meeting',
    start: '2021-01-25T10:30:00',
    end: '2021-01-25T12:30:00'
}   

Regards, Marcin