RTP describes the game’s long-run average return: 96% RTP means a 4% house...

https://varimail.com/articles/does-session-timing-matter-in-online-casinos/

RTP describes the game’s long-run average return: 96% RTP means a 4% house edge. Volatility affects how uneven wins and losses may be. In a short session, results can differ sharply from the average, so don’t treat RTP as a promise.