Before your first session on UFO Pyramids
Set your budget before the first spin, because the bonus round may not come at all in a session. How often it comes is not known in advance, and no figure on this page changes that. The result of one session is random whatever the RTP, so a losing run is possible on any game.
Read the game rules before you stake real money, because the RTP version in use is shown only there. Once you have found that line, you know which return figure applies to your play, so you can judge each stake against it.
Plan around the bet you choose, not around the top prize, because the maximum win is a ceiling reached very rarely. Treat it as a limit on what the game can pay, not as a target that a session is built to reach. The amount depends on the stake, so the same ceiling means different money at different bets.