I would suggest you to use the RadDateTimePicker in TimePicker input mode again with little modifications. Firstly set the DateTimeWatermarkContent
property to something like "Enter duration" (depends on your scenario). After this set RadDateTimePicker DateTimeFormat to 24 hours mode so it will display 13:00 instead of 1:00. Here is sample code:
I hope this will help you.
the Telerik team
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