Agreed what brk said. You should also consider the frequency of usage that your product needs. If your product has kind on once a day usage, you can provide a

Agreed what brk said. You should also consider the frequency of usage that your product needs. If your product has kind on once a day usage, you can provide a 7/15 days trial. But if the frequency is around once a week you need to provide a longer trial days. You can think of this equation (no claims of result- just what I have used): F = number of killer features in your app UC = usage count to get used to the feature freq = frequency of usage in some units Then your minimum trial period should be something like: Trial Period = F * UC * (1/freq) Hope that helps