Rambo III (1988) and Rambo (2008): 20 years

After naming the sixth film in the Rocky series simply Rocky Balboa in 2006, Sylvester Stallone took the same approach to the fourth Rambo movie, naming it simply Rambo. (He left off the first name John, for whatever reason.)

The film was successful enough to spawn a fifth and allegedly final Rambo movie, Rambo: Last Blood, in 2019, 11 years after Rambo.

Rambo follows John Rambo as he rescues Christian missionaries being held in Burma. It made $113.2 million worldwide against a production budget of about $50 million.