Do you do daily prizes? How often does a new Ethereum hash come out?
Yes, we have 4 types of time-based jackpots in Ethex: Daily, Weekly, Monthly and Season Jackpot and one chance-based Superprize! When you select more than one cell, your bet play for all 4 jackpots - even if you didn't guess the hash. To play for Superprize, you need to select all 6 cells.
The Ethereum block is mined about every 13-15 seconds, but you can bet as often as you want.