Bingo rounds play out in rapid succession with either Manual Daub 2-Card rounds, or Auto Daub 15-Card rounds!
Once you've reached level 3 to unlock the Auto Daub option, you can sit back and watch the Bingos roll in; pop extra XP Bonus Balloons during these Auto Daub rounds for bonus Experience Points!
At the end of the round, you can quickly replay another round with the same bet.  Pressing and holding the Replay button will enable Auto-Replay mode; rounds will continue with the same bets until you decide to stop.

Hint: in 15-Card Auto Daub rounds, you can tap the numbers called at the top of the screen to speed up calls!