As explanation previously about the interval of pools, that will help our pool wallet to maintain gradually and stability.

Let me illustrate PPLNS. One round has an arbitrary number of shares which is solely based on sheer luck. On proportional reward system only shares of one round are considered for calculating rewards. However with PPLNS, a quite constant number N of shares is considered for calculating rewards. This number N changes only with the difficulty. As you know the number of shares needed to solve a block within a round is different. Round one and three needed (difficulty * 2)shares to be solved. Round two and four are quite short rounds. There were less than (difficulty * 2) shares necessary to solve them. Round five however is a very long round which means the pool needed more than (difficulty * 2) shares to solve the block. From this follows that:
Rounds one and three are like proportional rounds. All of your shares from the given round are considered for reward calculations For rounds two and four, shares from the previous rounds are considered for calculations as well (marked green). In other words: regardless of round boundaries we always consider the last (difficulty * 2) shares. Your portion of the amount of shares is used to calculate your reward. Round five however is very long. In this round your lowermost shares (within the marked red part) are silently dropped if they are not within the last (difficulty * 2) shares.
(source: give-me-coins)

In conclusion with the method above and interval payment to help and get rid of Jumper Miners. Please correct us if we got some mistake.