Longest tenure in WWE

Hey Scott,

With Randy Orton being on WWE TV for the next several years, who had the longest continuous run in WWE excluding behind the scenes people like HHH? I think it could be Orton when his contract is up. Cena obviously has taken huge breaks lately. I think Big Show was gone for sometime to get in shape. Could it be Undertaker?

I guess it depends on what you mean by "continuous", because Undertaker supposedly retired after the Reigns match.  But certainly no one else had been around since 1990, so I'd say he's a runaway choice for #1, yes.