Hi Annie,
We considered adding the ability for creating custom intervals, but we needed first to know what custom intervals our customers are going to use and how they are going to define them. This feature request is logged in our PITS system
here. If you wish you can vote for it and leave comment describing your particular scenario so that it is taken into account when creating the feature.
All the best,
Yavor Ivanov
the Telerik team
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