I've read through the fusion document...But am clueless on getting average over a fixed time window...

In the stocktick sample, using sliding window I could get average for every event happening. 

But I would like to get the average for a fixed time window.

For example, if I would like to know the average stockprice of 'RHAT' for every fixed window of 30s, how this can be achieved in drools fusion?
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