Conversation so far:
When was Tropic Thunder filmed?
Tropic Thunder was filmed in 2006.
Who was in Tropic Thunder?
Ben Stiller, Jack Black, and Robert Downey Jr. are some of the cast members of Tropic Thunder.
Any other famous actors in Tropic Thunder besides Ben Stiller, Jack Black, and Robert Downey Jr.?
Nick Nolte, Steve Coogan, and Jay Baruchel are all cast members in Tropic Thunder.
How long did it take to film Tropic Thunder?

Question: how long did it take to finish filming?
Self-contained rewrite: How long did it take to finish filming on Tropic Thunder?