Why do you shut down the server after working hours? Why don't you just run samba through xinetd. With xintetd, you can restrict access by time if you want.
A great tutorial on configuring everything in xinetd (except time restrictions) is here:
http://www.openna.com/documentations...ndex.php?e=0,1
Just add something along the lines of:
access_times = 11:30-13:00 17:30-09:30
This will restrict access during lunch and from 5:30 to 9:30 in the morning
You should also check out this site:
https://www.linux-magazine.com/issue/20/xinetd.pdf