I have a iPad-3 and the way I use it is like 2-3 Hours in the Morning then 1-2 Hours in the evening and some 3 Hours in the Night. I have a Apple Smart Cover. What is the best way to preserve my battery and also ensure that constant on and off does not harm my iPad what do you guys suggest should I leave it on all day and let the Smart Cover wake it and sleep it or To turn it off is a better idea so the iPad is not unnecessarily on. Especially when I may use it after a gap of 4 Hours. With the kind of usage I have mentioned.