I would have to say it really depends on what "type" network admin you are...

I'll give you my daily life...or up until 5:30 today when I become unemployed.

8:30-9:00am - Check voicemails/emails regarding evening problems
9:00-9:30am - Check AO for new posts
9:30-9:45am - Smoke break
9:45-10:30am - Work on 1000 last minute requests from people who seem to think that giving us new user creation forms a day or two in advance is a dumb idea
10:30-10:45am - Smoke break
10:45-12:00pm - Take phone calls from people who are complaining the new user they have that starts today doesn't have an account, even though they sent me the request form at 10:30
12:00-1:00pm - Lunch (Anywhere but at the office)
1:00-2:30pm - Explain for the 1000th time what the DESKTOP is to idiot users who can't figure out that it's where all the icons are.
2:30-2:45pm - Smoke break
2:45-4:00pm - Answer 15 tech support calls from people who can't understand that you have to put paper in the printer before you can print
4:00-5:00pm - Work on "project of the day" - Won't be project of the day tomorrow, but still must be worked on today
5:00pm - GO THE HELL HOME