How many devices does one purchase of Android app support? I have purchased an app from the Play Store. How many times I can install the same app on different Android devices?

Is there a limit?
There is no limit. From Google Support:


  Downloading previously purchased &amp; downloaded apps
  
  When you download a paid or free app on Google Play, the app is
  connected to your Google Account, meaning that you get several
  benefits:
  
  
  If you get a new device, remove an app to free up space, or reset your
  device, you can reinstall the app without purchasing it again.  
  If you have multiple devices, you can install the app on all of your devices
  without purchasing the app again.  
  You can quickly find free or paid
  apps that you previously downloaded.