Can you expand your question a bit?
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Extracts are a snapshot of your live data. It just speeds up the query process if you have high volume data. So far, i have not faced any challenges while doing calculation using extract data. The experience has been the same for live and extract data. However, if you are facing any hiccups in particular, you can feel free to share the exact pain point so we can all understand and give a focussed answer.