i would say thats definatly enough, but if you can get any further experience, without too much effort and you have the time, more is always better. its quite a good idea to have some arranged for after the interview period. they will often ask if you have any further work experience arranged, if you do, it obviously looks good and shows you arnt just 'jumping through hoops' but seriously considering the carreer to which your aspiring.
but yeah, thats a great amount of experience, make sure you remember what you saw and what you learnt, experiences blahblahblah as they will definately expect you to talk about it in detail