Look at "TTF" on the pools site.  https://premiumminer.com/site/mining
It says average time to find a block at full pool speed (currently ~350 GH/s) is fluctuating between 33 hours and 48 hours.
This small pool is going to fluctuate quite a bit due to luck factor.  But there's a chance of good luck and getting a nice payout.
And a chance of bad luck, no payout for days.