Thank you for writing.
Since your timescale is Days, all appointments will always take the whole space for the day, and limiting the working hours is not possible. The only thing that you can do (if it works for you) is to edit the Edit Appointment
dialog and set ranges of the Start time and End time hour pickers. However, this approach will only handle the appointments added by the dialog and those added by using inline editor will be all day appointments.
I hope that you find this information useful.
All the best,
the Telerik team
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