How can I find out when and how long a movie/show is filmed on a set?

[anto-youth]

Hello:)

I am kind of new to collecting, especially to via venue, but I am from Germany, so it is a great way to get bigger stars without paying so much for international postage.
I did some research, but I didn't found out what movie/ shows are filmed in Germany Babelsberg studios for example or in the US Disney shows. How do I find out these information, and then for how long the address would be valid.

Thanks!