2Miners pool uses fair reward system "Pay Per Last N Shares" - PPLNS 12000 Shares. This system is used to prevent "pool hopping". Pool checks how many shares you've sent from the last 12000 of pool shares and makes the payouts based on that value. For Equihash coins 20000 last shares are taken into account.
Ethereum - last 50000 shares
Other Dagger Hashimoto - last 12000 shares
Equihash - last 20000 shares