How often will the bonus round land?
Deciding how long to play starts with one fact: the bonus round does not arrive on a schedule. Nobody can tell in advance how often it comes, because every spin is random. A run of base game spins can end a session before any free spins appear. The RTP is an average over a very large number of spins, so it does not predict one session.
Before you compare the three RTP figures, find out which version your session runs. Which RTP version runs on Hunnyplay Casino is shown only in the game rules. A higher version returns more to players over time, but it does not change how any single session plays out.
Read the maximum win as a ceiling, not an expectation. The maximum win of Sugar Rush 1000 is x25,000 of the bet, and the game reaches that ceiling very rarely. At the example bet of A$10, that ceiling equals A$250,000.