I think this works both ways. With only a 15-minute window, less people will buy your app but there will be less cancellations. With a 24-hour window, more pe

I think this works both ways. With only a 15-minute window, less people will buy your app but there will be less cancellations. With a 24-hour window, more people will buy your app but there will be more cancellations. I don't have any data to back things up but it's possible that the number of downloads will be the same. And according to Google's stats, most refunds happen within 15 minutes. However, having a shorter refund window is more beneficial to developers in terms of handling their business and will reduce abuse.