Gates of Hades results stay random every time
Decide your budget knowing that the bonus round has no set schedule. How often the Free Spins arrive is not known in advance, and the result of one session is random, whatever the RTP. A quiet run does not mean a bonus is due, and a fast win does not mean the next one is close.
Read the game rules before you decide how to play, because the RTP version running on a game is shown only there. Pick your stake with that figure in view, and treat it as the long-run return the rules describe, not a promise for your session.
Judge the top prize as a ceiling, not a target, before you set a bet. The maximum win of Gates of Hades is a multiple of the bet and it is reached very rarely. Set your bet by your budget, because the ceiling says nothing about how a session will go.