Increase password prompt timeout for CentOS 7

We are usually using ssh + keys to access our servers.

Recently I had to give a password to another person to enter into the login prompt in person at the client location, with monitor and keyboard and all. I wanted secure servers so I set all passwords to 50 random characters. Never actually tested that a normal person can enter them.

The problem is that shortly after you start entering the characters the password prompt resets. I'ts not that shortly, but its 50 characters...

Can I somehow get that timeout increased?

PS. I'm talking about this screen:

This should be possible to set in /etc/login.defs with the value LOGIN_TIMEOUT.

http://man7.org/linux/man-pages/man5/login.defs.5.html

       LOGIN_TIMEOUT (number)
           Max time in seconds for login.