What can one session tell you?
Deciding how long to play Big Bass Reel Repeat depends on a bonus round nobody can time. Free Spins arrive at random, and no session shows how often they come. The RTP describes return over a very large number of spins, not the result of your session, which can end with a long dry run or a quick run of Free Spins.
Choosing a stake starts with knowing which RTP version runs in this game, and that detail is set out in the game rules. Read those rules before you place a bet, because the version applies to every spin you play. The return figures on this page refer to that version.
Setting a stake should account for the maximum win, which is 5,000 times the bet. At the A$2 top example bet, that ceiling is A$10,000, and the game reaches it very rarely. Reaching it is a ceiling, not an expectation.