Known paytable, unknown session result
4 or more Zeus Scatter symbols anywhere on the grid start the 15 Free Spins, but how often that happens cannot be known before you play. The result of one session is random whatever the RTP, so a long session and a short one can both end with nothing. Set a budget you can afford to lose before the first spin.
96.49% and 96.50% are the two RTP versions of Gates of Olympus 1000, and the game rules show which one is running. The gap between them is 0.01 percentage points, so the version changes little in a single session. Read the game rules before your first spin.
15,000 times the bet is the ceiling of Gates of Olympus 1000, which is A$75,000 at the A$5 example bet. Rounds that reach the ceiling are rare, and no session can be planned around one. A high ceiling says how much a round can pay at most, not how often it pays.