I am afraid that you cannot set DayStartTime and DayEndTime for each day in TimelineViewDefinition - DayStartTime will be applied only to the first visible day and DayEndTime - to the last visible day. This behavior is actually by design.
I would suggest to use WeekViewDefinition instead, you can check this example
where it is demonstrated how you can filter the shown days.
Hope this helps.
All the best,
the Telerik team
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