I have this application: http://www.youtube.com/watch?v=Tn7_yNt1OaE
I made a mechanism that counts the number of times the app has launched, and measure the playtime duration as well.
I want to remind the user on she/he can support the development, can help others to find my app by dropping a rate in the App Store (I have instant App Store link format as well).
The only thing I want to discuss here: How often/rare should I remind the user?
The first should be about after 15 launch, and 3-6 hours of playtime... ...or not? And the second? Have you any experience on it?