This wouldn't work well for all apps. For example, I went on a trip to the Rockies in November and wanted to check the elevation at the lodge I was staying at. I downloaded and ran elevation app to find out. Took only moments to find out and even with fiddling around the the app while hiking I probably spent no more than 5 minutes on it but it was completely useful for the purpose I had downloaded and used it for. Should limited use/one-time use apps not be counted simply because they weren't used for an arbitrary amount of time?