You can set the time interval to either 1,5,10,15,30, or 60 minutes inside the Configure the view section. If you’re just starting out, it isn’t very obvious and the documentation isn’t clear for this.
The Configure the view button is on the right above the fields in the Content-Type Builder of each content type.
Once you’ve opened the Configure the view, click the pencil to edit the date field you want to change and you’ll find the Time interval (minutes) option there.