How to calculate size of Tomcat temporary directory?

Question

Java

Good afternoon!
We have a web application running on Tomcat7. It all works on Windows.
For our customers, we need to provide requirements for the resources necessary for the application to work. How to calculate size of Tomcat temporary directory? What does it depend on? Is it the number of requests, on the type of requests?
PS We did not develop the web application, but there is access to developer support. They say that this is not a question for them, because. they are responsible only for the web application, and these temporary files are used by Tomcat itself, and not by their application ... Who and why stores files there?