The plugn has English language but the description is in Italian.
However it says just that the default block is for 3600 seconds (1 hour) after 5 wrong logins, but you can modify these numbers on the file of the plugin (there are two constants).
If you're blocked but you are the admin of the site you can delete the file fp-content/%%anti_bruteforce.txt and then you can login again.
The control is based on IP adresses and sessions. It doesn't block definitely the administrator, however an update could be that after n (for example 100) logins the login is blocked for everybody...