CleanUp Policies

We are using Nexus Repo Manager 3.15 on Linux, and need to execute some CleanUp policies. I can see through the rule creation roughly how many objects will be removed. (~7350)
My questions are:

  1. Can I export the entire list somewhere vs seeing the first 50?
  2. Is there a way to determine how long the clean up will take?
  3. Is Nexus unavailable during the CleanUp Policy execution and/or the Admin Compact Blob task is executed?

Thank you in advance.