It really wasn’t unusually long in post.

After 25 months of pre-production, filming began on August 24, 1992, at Olokele Canyon.

Jurassic Park premiered at the Uptown Theater in Washington, D.C. on June 9, 1993, in support of two children's charities.

It was a lot of work from multiple teams, but less than a year from starting filming to theatrical release.