Why are there only a few blocks found?

http://dogepool.pw/index.php?page=statistics&action=blocks
Live Pool Info
Pool Hash Rate: 792.294MH/s

According to this, there would be a block in 22 min?
https://www.litecoinpool.org/calc?hashrate=792849&difficulty=245.18329466&power=&energycost=0.10¤cy=USD