I see that by default the radscheduler will assume 1 hour appointment slot. Even when user hovers over the control, the one hour slots are highlighted. How can i change this to say 30 min. appt slot?
I don't think there is a way to change the standard appointment duration to anything other then one hour. You might want to check with Telerik support, because there may be a sneaky way of doing it that I cannot see. I don't even think that is possible in Google Calender or Outlook. Personally, I've gotten very used to just updating my end-time when my appointment is more or less then one hour. You might be able to save your users a little time by turning on the "StartInsertingInAdvancedForm " option if you expect the majority of appointments to be less then one hour. Here is the relevant documentation:
http://www.telerik.com/help/aspnet-ajax/scheduler-adding-appointments.html