User blog comment:Dailyapk/Gooogle refuses to budge on 15 minute refunds/@comment-1693968-20140818183815

Google Play is actually the only major app store to offer such a convenience. In other app stores, such as Amazon's and Apple's, there is no refund available at all. As soon as you make the payment, you have no way to get it back. Google offers 15 minutes to refund.

In addition to that, I think 15 minutes is an ideal time. Most people will be able to download and try any application within that 15 minutes, and unless you have rural internet, there shouldn't be any risk there. Anything longer than 15 minutes, and you have the risk that people will download and play the app for awhile, and then get all their money back. The 15 minute refund is designed to ensure that people are not cheated. If an app isn't what it claims to be, you can just get the refund. In the case I just described, the developer ends up being cheated, and the system is abused.