like pginvest said: i don't think you should even try... It would come as a big supprise to me if you ever made enough ALTcoins to be able to withdraw them, especially before your ipads are completely broken.

Same goes for CPU mining on your pc (for example, using minergate): there's a reasonable chance you'll ruin your pc, and the chance of your electricity bill being higher than the amount of coins you mine is allmost 100% (unless you have free power)