1. Yes, if you and someone else are playing an online match from the same IP adress, your booster will still reward you when you win a match against them.
2. A booster will last for however long you subscribe for. If you choose to pay for 1 month of tc booster use, you will receive the boost everytime you win for 1 month.
Also, regarding the 1st question, I suggest you do not fight constantly from the same IP adress mainly because certain GMs might do an IP check and think that you are farming qi/tc if you are streaking against that person.
But if you two must, then go ahead. you won't be breaking any rules by playing fairly against each other. Just don't farm.
Last edited by IceShadow; Feb 27, 2011 at 08:32 PM.