RTP estimates returns over time: 96% RTP means a 4% house edge. Volatility...

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

RTP estimates returns over time: 96% RTP means a 4% house edge. Volatility affects how sharply results swing. In a short session, you can win or lose much more than the average suggests; past results don’t predict what comes next.