Um ... that was from me

Any share submitted in the last 5Nd when we find a block, gets a reward.
You don't have to be mining at the time the block is found, only you have to have shares in the range before the block was found:
What this means is that (as stated on the page linked in the previous post) when we find a block, KDB counts back all shares submitted until it has counted the equivalent value of 5 'expected' blocks worth of shares.

So as diff is currently about 5 bazillion, when we find the next block, all the previous 25 bazillion worth of shares will be included in the reward.
This also means that each share gets about 1/5 of it's PPS value.
But since we include 25 bazillion each time a block is found, then on average each share gets rewarded 5 times so is expected to average to get 5/5 of it's PPS.

Of course if you want it more accurate, you should replace '5 Bazillion' with 5,077,499,034,879.0 and '25 Bazillion' with 25,387,495,174,395.0
Of course there's no point saying  5 Trillion, since Trillion is not an SI unit, and it differs in some countries.
T in TH does NOT stand for 'Trillion' it stands for the SI unit 'Terra' meaning 10^12
So you could say something like: 5 and 25 TerraDiff worth of shares

Now if you are mining 50% of the time, what you will end up expecting to get is a reward for 50% of your hash rate, of course.
Also, like on any non-PPS pool, if you don't mine all the time, you will get higher variance than the normal pool variance.

Now one more thing to add - price switching is a fallacy.
You don't get the price at the time you switch, you get the price some time a day or more later when you finally get and convert the mined 'other' coin ... less the extra fees to convert that 'other' coin vs the price and fees to convert BTC

Welcome! All work is paid--even if you stop mining, and we find more blocks within 500% of the network difficulty after you stop.

Edit: See here for a detailed explanation of the payout process: https://kano.is/index.php?k=payout

Edit 2: Due to the ramp up/down behavior of PPLNS, you'll hit full payouts within approximately 6 days at the current pool hashrate. However, as mentioned, you'll also continue to receive ramp down payouts for approximately 6 days after you stop mining.