How long does it take Google to update app download data?

[shamefulzero]

I have an app in the play store (cleaner & launderer mobile) and the appstore. I have created a facebook install app ad on facebook and the info it tells me doesn't translate into the google play store. Facebook tells me i have about 20 people clicking on the ad daily but its not showing a higher download count in the play store. How can i get proof people are actually downloading the app? Thanks for your help.

 

[shamefulzero]

Is this question in the wrong section? no one knows how fast the download app count updates in the play store?