If you look at the account page on mining.bitcoin.cz, on the left hand news column, first item.
25.04.2013
Pool is in normal operation, delayed payouts will be processed in the afternoon (UTC).
Which might mean any time from 12:00 to 23:59 UTC, a timespan of about 12h. It was just this month we saw the BTC price drop 60% in less than 6 hours...