Can I not show end time and duration of a booking to my customers?
If you do not want to show the end time and/or duration to your customers, in your Bookeo account
1. Click on Settings>Booking preferences
2. In the End time and duration section, untick the checkboxes Show end time  and/or Show duration 
The checkbox to show/hide the end time refers to the main booking page, to reduce the amount of information shown during the booking process.