Forex When does the market actually react to news releases?

It seems some days the market will coincide with a news release and move along with it for a session or even for a day following into the next sessions around the world and then other times it's basically ignored. Sometimes it's followed for a brief period and sometimes it's followed for a long time as I said. How do you know when the market will actually follow the fundamenal or numbered data?

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The forex market's initial reaction to a news release usually lasts from 30 minutes to two hours, but the broader impact can last for days.

 

This is the catch of it, I am not sure anyone can tell for sure. But what I have noticed is that anytime there is a big news impact the market always does massive profits on sell.