Where is "autologout" set?

[Brett Glass]

I'm logging into a headless FreeBSD box via a serial port (which I don't 
normally do) and am finding that the "autologout" variable is being set 
to 60 minutes in the shell. I can't find where the variable is being set; 
it's not in /etc/csh.* or in any of the "dotfiles." Can someone tell me 
where this variable is being set, so that I can adjust the time or 
disable automatic logouts?

--Brett Glass