Sir, you'll have to be more specific, do you mean how long do the deals last or do you mean my PPU offer? If the former, 20 days, if the latter, it's case by case and based off stock market prices.
On other planets, I go by "NoMutantAllowed". I simplified my name to "Mutant" here, but my IRC name reflects my past name, mostly due to recognition and my IRC nick being registered since 2009.