When the bonus round shows up
Before you set a stake, accept that how often the bonus round comes is not known in advance. The result of one session is random, and the RTP does not change that for any single visit. Two players on the same version can finish far apart after the same number of spins, so treat each session as its own event and set a limit before you start.
Open the game rules before you commit a stake, because which RTP version this lobby runs is shown only there. Once you know the version, you can read its return next to the other version and see the gap in money. Do not rely on memory of an older title, since versions of the same game can differ.
Read the top prize as a ceiling, not a target. Sweet Bonanza's maximum win is reached very rarely, so the bet you place does not make it likely. Plan each session around the stake and the time you want to spend, not around one big hit.