I have sent a request to eigen-core-team@lists.tuxfamily.org and eigen@lists.tuxfamily.org, so that I can create a account on Bugzilla and get added to the eigen public mailing list. On an average, how much time does it take to get added on the list, given I am constantly checking my spam folder to receive a mail ?

Use the following email address:
eigen-request@lists.tuxfamily.org

I used it today and got a response within a few minutes.