Bonus frequency and session results
Each spin of Gates of Olympus lands a fresh grid, and the free spins start only when 4 or more Scatter symbols appear anywhere. Nobody can say in advance how often that happens. One session can bring no bonus round or several, and its result is random whatever the RTP. The RTP is an average over many spins, so it says little about a single session.
The reels show symbols on every spin but never show which RTP version is running. That detail sits only in the game rules, so check them before the first spin. The version named there is the one running on the reels.
Tumbles can chain one after another, and Multiplier Orbs can lift a single win, yet the top of the win range is a ceiling reached very rarely. The maximum win is x5,000 of the bet, which is A$50,000 at the A$10 example bet. Nobody can plan a session around it.