So, How Many Units Will I Need?

OK--so I should have thought of this sooner, but I didn't so now I'm forced to look like an idiot and ask this dumb question. Anyone have an idea approximately how many units it takes to cover a year of school?

I mean, I know I need as many as it takes to cover the standards. So far I have 8 in outline form and I still have weeks of school left. How are the rest of you doing? What are you discovering? Do your schools have curriculum maps they ask you to follow? How do the various teachers keep track of what the others are doing? Are your Departments well oiled machines, or are there funky things going on? I've had my first "situation of the day" moment and school hasn't even started yet. Yikes!