Straight to your questions:
1. In order to change the size of the TimeRuler you need to set Min/MaxTimerRulerExtent
properties of the ScheduleView. You can see an example how these properties work in this online demo
2. You can create a CustomTimeRulerItemStyleSelector
and set different colour for the minor and major ticks. More information you could find in this help article
Hope this helps.
the Telerik team
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