I would like to build an app that estimates how long it might take an app developer to have his app approved by Apple. Here's how the app would probably work: The developer tells the app when he or she submitted his app to Apple. The developer also has to certify that he or she is absolutely sure that the app meets Apple's written rules. My app would then use a crowd-sourced database to estimate the number of business days until the app is approved. If the developer has published at least maybe 6-10 apps, the app will construct a confidence interval based on the average approval time of those apps and how much the approval times tend to vary from the mean. Is this a good approach?