What is the orchestra size needed for Gershwins's concerto in F?

Answer 1

I found a webpage that may answer your question. (I'll paste the link in the "Source" area below.) Here's an excerpt:

"The instrumentation alone took him four weeks. He completed the piano concerto at the beginning of 1925, calling it Concerto in F. Full of jitters, Gershwin hired 60 musicians and a conductor, rented the Globe Theater for an afternoon and secretly tried out the piece..."

Answer 2

I always thought the size of the orchestra didn't matter, just how good they play.