Before the first spin of this game
Deciding how long to keep spinning means betting without knowing when the bonus round arrives. How often the free spins trigger is not known in advance, and no figure on this page predicts it. The result of one session is random whatever the RTP, so a single session can end well above or well below the stake. The RTP describes the long run, not the next spin.
Deciding which RTP version to expect starts with the game rules. Only the game rules show which version Bingobilly Casino runs, so check that screen before the first spin. The RTP table shows the money return for each version per A$100 staked.
Weighing the top prize starts with the ceiling, which is x10,000 the stake. At the A$10 example top bet that reads as A$100,000. Reaching it is very rare, and the maximum win is a limit, not an expected return.