I might get this wrong, but I'm pretty sure here's how it works. There's a time window, a certain number of hours, and then if you achieve mining shares within that window, and the pool finds a block, then you end up getting paid out for that time frame based on how many shares you put in.

I don't know what your hash rate is, but with all of the hash on the network, it might take some time for you to see a payout.

Could be several days.

Also, in case you're on a PC, Windows doesn't allow for the very best utilization of your cores. So, if you run it under a Linux environment, it will work twice as good, basically.