When will The Wild Gang's bonus round arrive?
Choosing a bet size is the part you control before the first spin. How often the bonus round comes is not known in advance, and no run of past spins makes the next one more likely. The result of one session is random whatever the RTP. A long run moves toward the RTP over many spins, while a short session can finish well above or below it.
Before you stake, find out which RTP version runs on this site. That answer is shown only in the game rules, so open them before the first spin. The gap between the two versions is small, but it applies to every bet you place.
Deciding a bet around the top prize means planning for a ceiling, not a result. The maximum win of The Wild Gang is x10,000 the bet, and that ceiling is reached very rarely. No rule in the game lets you predict when it will land, so set the bet and time limit before you start.