When will the next round arrive?
Deciding how long to play starts with one fact: nobody can know in advance when the bonus round will come. Its timing is random, and so is the result of any single session, whatever the RTP. A quiet stretch of base game spins tells you nothing about the next bonus round.
Picking between the two RTP versions starts with the game rules, because only they name the version running in this lobby. The figures table lists each version and its return in money, so read it next to the rules before you open a game. Do not assume a version from the title or the artwork.
Checking the top prize starts with one question: how much can a single bet return at most? The ceiling is a multiple of the stake, so the cash figure rises with each bet level. It is reached very rarely, so treat it as a ceiling, not an expectation.