The Life of the Party - S5-E22
Continuity mistake: At the singles party Frasier throws, Roz tells him she's in labour. She is not holding anything, but soon a small purse appears in her right hand, out of nowhere. When Vicky says "good luck" to her, the purse is nowhere to be seen.
Answer: It equals the record of James Arness of "Gunsmoke" for the actor who's played the same part on TV NOT in a soap opera. If you include soaps there are two main contenders - William Roache, who's been playing Ken Barlow in "Coronation Street" in the UK since 1960. Don Hastings has been playing Robert Hughes in US soap "As the World Turns" since 1960 as well.