RTP estimates the share of stakes a game returns over a very large number of...

https://www.pure-bookmark.win/rtp-is-a-long-run-average-house-edge-is-the-casino-s-expected-share-96-rtp

RTP estimates the share of stakes a game returns over a very large number of plays; it is not a promise about one session. A 96% RTP means a 4% house edge on average over time