Sorry folks, answered my own question, RTFM!
usermod -x logon_hours
logon_hours=time-string
Sets the days of the week and hours of the
day during which the
account holder can log in to the account.
The time string format is
an entry of Dd0000-0000 for each day and
time that logins are
enabled. Time is given in a 24-hour clock
format. For example, to
restrict logins to Sunday, Monday and
Wednesday:
Su0830-1730,Mo0830-1730,We0830-1730
The hours are restricted to 8:30AM to
5:30PM.
L
Received on Fri Oct 22 2004 - 13:08:05 NZDT