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https://en.wikipedia.org/wiki/John_Munch#Continuity

The character of Munch has appeared in a total of ten series on five networks since the character's debut in 1993. Apart from Homicide and SVU, however, Belzer's performances as Munch were guest appearances or crossovers rather than regular or recurring appearances. With Munch's retirement in the character's 22nd season on television, he was a regular character on U.S. television longer than Marshal Matt Dillon (Gunsmoke) and Frasier Crane (Cheers and Frasier), both of whom were on television for 20 seasons; he is only behind Mariska Hargitay's character Olivia Benson. Munch's return to help his friends in the SVU seventeenth-season episode "Fashionable Crimes" marks the 23rd season that the character has appeared on television in any capacity.