RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge...

https://record-wiki.win/index.php/Can_I_Use_%E2%80%9CStop-Loss%E2%80%9D_Thinking_for_a_Casino_Session%3F

RTP is a long-run average, not a session promise: 96% RTP means a 4% house edge over time. Volatility describes how uneven wins and losses can be. In a short session, results can differ sharply from the average, and you can lose your stake.