RTP or return to player percentages are listed in each game provided. The RTP is not calculated on your gaming session alone. This percentage is the probable return for all play on the game.
You can win or lose, and the wins or losses are calculated for all players not a single session.
For Example, if the RTP is 95% and you deposit and spend 100 there is no guarantee you will get back 95 USD or any set amount as its calculated on all play not your session alone.