newbie question

[SuDaNym at aol.com]

Hello
 
Can anyone give me a very rough estimate on how much time is required on an  
ongoing basis, after a server is set up with FreeBSD and Apache, to maintain  
everything.  By everything I am referring to everything required to keep  the 
server up, and host about 100 domains.  Thank you in advance and I  apologize 
if this question is not appropriate for this list.
 
Sue