playing on both PS3 and PC?

[mouseno4]

If I paid for 180 days, and received my rewards already, will adding a PS3 account give me 30 days on top of 180 days?

My understanding is that included game time from purchasing the game, will add to your already active included game time from your original purchase. So whatever is left of your original copy, plus the extra 30 days from the second purchase, would equal your total included time. If you wait until your first billing date - the day your initial included game time expires so that you become an active subscriber, your included time will extend your subscription time. If that makes any sense.