Read the game rules before wagering
Deciding to play Bigger Bass Splash means accepting that the bonus round has no schedule. How often Free Spins trigger is not known in advance, and no spin shows when the next trigger will land. One session can end with no bonus round at all or with several. The result of any session is random, whatever the RTP of the version you play.
Choosing a version to play starts with the game rules. The RTP version running on this site is shown only there, so check them before your first bet. Each version carries its own figure, and the versions table on this page sets them side by side.
Chasing the top prize starts with knowing what it is. The maximum win is a ceiling reached very rarely. It marks the most the game can pay, and it is not a typical result. Read it as a limit on the payout, not as a target.