Generally speaking, mobile games tend not to have much longevity, when compared to titles, such as Dragon Age or Fallout 3. There are several reasons for this, the most obvious one being the (usually) simple mechanics mobile games are built around. We don't mean that players cannot play Fruit Ninja or Angry Birds for a total of 60 hours or so, but it's not very likely that the average casual player will spend even 10 hours to unfold the story that may be told in a mobile game. At five hours of total gameplay, the player must in fact complete 120 two and a half minute save games. At 50 hours of the total gameplay, the player must complete 1200 two and a half minute save games. Are you sure your gameplay is sustainable over 1200 save game points?