Unseen odds, streaks and bonus timing
Deciding how long to keep spinning before a Free Spins round arrives has no fixed answer, because the bonus round comes at random. It can land on any spin, and no number of spins before it is fixed. Even at the stated RTP of 96.51, one session stays random, so a short run or a long run says nothing about the next one.
Before you start a session, check which RTP version runs on this game. Retrobet names the version in the game rules, so open those rules first. Treat them as the final word on the version, and let them decide which figure applies to the game you are playing.
Deciding how much to stake starts with the ceiling, which sits at x5,000 of the bet. The game reaches that maximum win very rarely, and no session can promise it. Keep each stake within a budget you can afford to lose, and treat the top figure as a limit rather than an expectation.