I purchased this app to set time limits on my daughters iPad. I had expected that you could set an amount of time per day and that the app would keep track of it automatically. In reality I discovered that you must set a time limit each time the child picks up the iPad, and it does not pause when the child puts the iPad to sleep. So another words, the child cannot "save" his time and parse it out. This was not what I was looking for.
lostmomof4 about Playtime Timer