How often does the bonus round arrive?
Deciding how long to keep spinning Mustang Gold is easier when you know that the bonus round cannot be timed. No one can say in advance how often the Jackpot Reveal Bonus Game or the Free Spins Feature will appear in your session. The result of one session is random, whatever the RTP shown in the rules.
Picking a stake and checking the RTP is a sensible habit, but which RTP version Casino Moons runs is shown only in the game rules. The table on this page gives its figures per A$100 staked, so read the rules before you start a session.
Choosing whether to play for the biggest prize means reading the maximum win as a ceiling. Mustang Gold pays up to x12,000 of the bet, which is A$12,000 at the example top bet of A$1. That ceiling is reached very rarely, and no session can be planned around it.