$400 - $1600 - $3200 per 6-8 hours? No one can say without knowing about the specific app, the advert implementation, and the amount of users you loose because

$400 - $1600 - $3200 per 6-8 hours? No one can say without knowing about the specific app, the advert implementation, and the amount of users you loose because of the implementation. I'd guess something around that much though.