pam_faildelay.so  [
        debug
      ] [
        delay=microseconds
      ]
pam_faildelay is a PAM module that can be used to set the delay on failure per-application.
      If no delay is given, pam_faildelay will
      use the value of FAIL_DELAY from /etc/login.defs.
    
debug
        Turns on debugging messages sent to syslog.
delay=N
        Set the delay on failure to N microseconds.
Delay was successful adjusted.
The specified delay was not valid.
The following example will set the delay on failure to 10 seconds:
auth  optional  pam_faildelay.so  delay=10000000