Well the thing is they didn't wrestle each other every single big event. Dreamer would wrestle Nest members, tag matches. The main focus of the feud was when they did clash Dreamer couldn't beat Raven, Until 1997 when Raven left for WCW.didn't people get bored of dreamer/raven feud because of how long it was
So the actual feud lasted 1995-1997 (three years)
In 1999-2000 Raven returned to ECW and they actually became Tag Champs, who still feuded.