You can only win one Blitzcasino Jackpot at a time.
However, it is possible to win several Blitzcasino Jackpots during the same day. Therefore, you could win the Blitz Boom Jackpot and Rush Blitz Jackpot jackpots all in the same day.
You can also win a Blitzcasino Jackpot at the same time as a specific jackpot in a game. This is because the Blitzcasino Jackpots are completely independent of other jackpots.