5 days is the most you can buy. If you wish to add days, you can buy single day hoppers up to the amount of days you want (e.g. 2 day PH + 5 day PH = 7 days) or you can buy an annual pass.
thats correct 5 days is max.. however if you are an Aussie or Kiwi living in those countries you can still get longer I believe ...someone can correct me if Im wrong..please...