Arriving at your first session unsure of the result
Deciding how long to play starts with one fact: nobody can know in advance how often the Free Spins round will come. The trigger is random, so a quiet stretch tells you nothing about the next spin. Even at the same RTP, the result of one session stays random. Two players with equal stakes can finish far apart, and neither result predicts the next spin.
Before staking, look up which RTP version runs in your lobby, because that setting is shown only in the game rules. The two versions sit close together on paper, and the result of one session still varies widely.
Choosing a stake also sets the top prize in money. The maximum win of Gates of Olympus 1000 is a ceiling that is reached very rarely, and it is a multiple of the bet, so the money figure rises with the stake. Use the table to see the money figure at each bet before you play.