Before The Spins Land, Nobody Knows
Reels that spin produce a result nobody can call in advance, and the same holds for when the free games arrive. The rate at which scatters land is built into the game and is not published, so no session can be planned around a round it is owed. A high return percentage describes the whole game over a vast number of rounds, not any single sitting.
Which of the return versions powers the reels is stated only inside the game rules screen, not on lobby tiles or banners. Two pages about the same slot may therefore quote different numbers, and both be true of different setups. Check the rules before you stake, since the figure sits at the bottom of the ladder here.
The 50,000x ceiling is a hard stop, not a target, and clearing it takes a combination landing in one round. Treat that figure as the outer edge of what the game can pay, not as a likely outcome. Most rounds finish well short of it, and no stake size changes the odds of reaching it.