The Community will be undergoing maintenance on Friday January 10 at 2:00pm - Saturday January 11 at 2:00pm EST, and will be "read-only." For assistance during this time, please visit our Help Center.
To control the size of a calendar event, you need two fields: one for the start time, the other for the end time. Also know that this requires your base to be in a Pro-plan workspace or higher. Bases in Free and Plus workspaces can only use a start time, and the event will always be an hour long.