i'm wondering how long the workers on Facebook's application Restaurant City can work until getting worn out. i would like to have the application running overnight while i sleep, so that way i can earn gourmet points. however, i don't want my workers to get worn out while i sleep, thus being unable to serve the customers, resulting in a "thumbs down" and losing popularity. so i'd like to know...how long does it take for the workers to get worn out? thanks! 