Before the first spin, nothing is certain
Deciding how long to keep spinning cannot rest on when the bonus round arrives, because nobody knows that in advance. Every spin is random, so the number of free spins triggered in one session is random too. Whatever the RTP, the result of one session is random, and a long quiet run does not mean a win is due.
Before you stake, open the game rules and find the RTP version. That screen is the only place the lobby states which version runs for Gates of Olympus, so do not assume it from the name of a series entry. Each series entry carries its own RTP and maximum win.
Choose your stake by what you can afford to lose, not by the top prize on the paytable. The maximum win is a ceiling of 5,000 times the bet, and it is reached very rarely. Nothing on this page promises that outcome, so treat the ceiling as a limit, not a goal.