2Miners pool uses a fair reward system "Pay Per Last N Shares" - PPLNS. This system is used to prevent "pool hopping". Pool checks how many shares you've sent from the last N shares of the pool when a new block is found and makes the payouts based on that value. N value is different for different pools:
Ergo, EthereumPoW - last 300 000 shares
Ravencoin, Kaspa - last 200 000 shares
Monero - last 100 000 shares
Grin - last 60 000 shares
Ethereum Classic, Callisto, Beam, Neoxa, Nervos CKB - last 50 000 shares
Firo, Zencash, Flux, BitcoinZ, Bitcoin Gold, Zcash, Aeternity - last 20 000 shares
The share rate of the miner is shown on the statistics page as well as the estimated daily profit of the miner. Please pay attention that this is just an approximate value. The pool blocks could include some transactions and cost more. On the other hand, the blocks could be Uncle or Orphan.