I've only been on a couple days with 2.1TH. I'm trying to understand the 500% thing.
https://bitcointalk.org/index.php?topic=789369.msg10108762#msg10108762But basically, each share you get is paid (0, 1, or more times) in each block found 5N (500% Network difficulty) after you submit the share.
If every block was found at exactly 100%, then each share would be paid 5 times, 1/5 of the expected payout amount for that share.
It reaches full payment at that 500% point (and gets no more after that)
So, basically, your payout for each share is spread over time in the future (500% Network difficulty).
Once you have been mining for 5N (500% Network difficulty) each payout will have shares through the whole payout period approximating to your hash rate so each payout will match pretty closely to what you'd expect for your hash rate.
Once you stop, you still receive (decreasing) payouts for the blocks found in the 5N (500% Network difficulty) after you stopped
(Edit: as the remaining shares fall off the end of the 500% payouts)