The information on this page refers to LM-X v5.4.1 or newer, which added brute force password protection. 

The LMX server has brute-force password protection for all commands that use a password as a parameter. This protection uses escalating time delays to prevent brute-force attacks, as shown in the following table. 

Failed attemptsDelay 
1 - 4None
51 minute
65 minutes
7 - 815 minutes
>= 91 hour