BigPicture how do I set sprint start and end time

[Dorte]

Hi all

I am new at bigpicture. Adding sprints to a new timebox I can only define start and end date. I find that BigPicture automatically sets start and end time to 12 AM

I need to define sprint start at 8 AM and sprint end time at 4 PM. How do I alter the default configuration? Is it possible?

Thank you