is there a reason why on the mining pools round times is like 10-20 mins then none are found for like 1-2 hours. Seems to happen to often to be just bad luck and its the same time periods on various pools
depends on the amount of people in your pool. Also some blocks take longer to solve than others. Amount of shares in a block is random.
edit: let me correct, depends on the pool hashrate, not the amount of people