A:AnswerIt should. However, Since the iPad Pro has 4 speakers, there are not cutouts for the additional speakers. The casing size of the iPad Air 2 and iPad Pro 9.7 are exactly the same though.
A:AnswerIt last for days... I was actually very impressed with the battery life. I've had mine on for days without charging it and the battery indicator never came on. So not sure how long it would really last if I let the battery drain completely.