FTP Authorization Failure time limits

[msiddhartha () netcom-sys com]

Hi,
When an FTP authorization fails thrice continuously, an error called 530: User not logged in (Your password is being 
rejected) triggers an alarm in some Enterprise SIM solutions. 

Can somebody please explain whether there is a time frame for the illegitimate login attempts after which the alarm 
fires? 
To elaborate the query, how much time space is allotted after every individual invalid login attempt for an attacker 
using Brute force by the FTP server? 

Thanks in advance

Cheers!

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