If you really can't keep your child off the iPad, how long should you allow him to play on it? Also, at what age should they be really using the iPad?

Siguro at the age of 7 and I only gave her atleast 1hour to watch. I put some limitation kasi pag sobra sobra napansin ko sa baby ko medyo di na sya nakikinig, iniiyakan niya na din kapag di nya nakukuha so I decided kahit atleast 1 hour a day or minsan nga ginagawa ko on weekends lang after ng school after noya matapos homeworks niya.