[He's not touching speculation because it hurts whenever Wanda or Vision lets him down. So he intends to just take the other thread and run with it.]

About as long as our version of Captain America. They, along with Clint and said Steve were the second Avengers team, after Pym and Van Dyne and Banner and Thor and Stark retired. Not that anyone seems to leave long. We've got a saying back home. 'Once an Avenger, always an Avenger'.

Hell, people have been on the team again even after all the conflicts.