A friend wants me to download for him onto his iPad an audiobook that's over 60 hours long. If I download it over 3G will it use up a lot of his 3G capacity and cost him money? If so, I'll do the download over wifi but when I see him we won't have wifi access. I don't know what his 3G plan provides but he probably has a pretty great package. I just need to know if this will be expensive for him before I do the download.