Do you allow your kids to play gadgets/ipads often? If so, for how long?

i will not allow my kid to play on ipad alone if really wan we will together listen to songs . for awhile . mostly will just do some craft thing with them or play board game. i love it as good boanding time with kid and the time pass fast here are some idea http://www.friso.com.sg/learning-and-experiences/emotional-strength/making-a-family-tree-with-your-child.html