How many migrations can I run simultaneously using CMS2CMS?

So to answer the question: Can I run multi-website migrations at the same time?
Well in short the answer is yes!
The CMS2CMS migration wizard can only manage a single migration at a time.
To run another migration simultaneously under your account you will need to open the wizard in another browser tab.

PLEASE NOTE:
You cannot run multi migrations for the same source and target sites simultaneously. Your migration will fail if you do so.