I'm curious that extremepool.org shows I have a Total Paid, but my wallet shows a zero balance after refresh. It hasn't been very long, but my experience with XMR on a couple different pools was immediate.
I'm further curious as to why the block reward is not always 320000, but usually some much smaller amount.
if you don't understand why the block reward isn't always the same read the op or the white papers it is explained..
as far as not receiving coins yet once the pool pays them I have been told the block chain is taking an extremely long time to sync up. I transferred some coins to poloniex earlier today and took about 6 hours.