Hello MacKenzie Mickelsen,
RadChart supports datetime axis with hundreds of thousand of data points. Check this example
With that said please check the following:
1) Are you using the ItemsSource property to databind the chart? If not you should...
2) Are you mapping a date time value to the XValue data point member in the series mapping?
If the answer to both questions is yes and you still have issues with this - please send us a small runnable project that we can analyze and fix for you.
All the best,
the Telerik team
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