Direct answer: The original Ghostbusters team had been in business for about 3 years before the second movie was released.

Quick timeline

  • Ghostbusters (the first film) was released in the United States on June 8, 1984.
  • Ghostbusters II was released in the United States on June 16, 1989, which is five years after the first film’s release; however, inside the films’ storylines the Ghostbusters had been operating as a team for roughly three years by the time of the second movie’s events.

Notes and context

  • The franchise’s production and release dates differ from the in-universe timeline; when people ask ā€œhow long were the Ghostbusters in business before the 2nd movie,ā€ most references mean the characters’ in-universe operating time, which is commonly described as about three years between establishing the business and the events of Ghostbusters II.
  • If you want exact release-date spacing (real-world): the two films’ releases are five years apart (1984 to 1989).

If you’d like, I can:

  1. Show a short HTML table with those dates and the in-universe vs. real-world intervals.
  2. Add brief plot notes about what changed for the team between the films.

Bottom note: Information gathered from public sources available on the internet and portrayed here.