vRO maximum executions possible ??

Hi

I am working on project where we are planning to use vRO as an automation tool, so wanted to check the maximums of vRO like:

1) how many workflow executions we can have at the same time?

2) how Manny workflows can be in running mode at the same time ?

3) how many configuration elements / attributes we can read and write at the same time ?

4) Inventory list limits ?

5) Database limits (SQL, Postgres)

Thanks!!