A lot of people subscribe to the "write every day" idea, but I never force it. If I'm not in a creative mood, I don't bother. So there is no normal for me, but if I get five good pages in a day, I'm happy.
It totally depends on my mood. Some days I'm lucky to get 5...other days it's more. I knocked out a 65 page script in 2 days last week after a total creative rush, but now I'm completely blasted and haven't written a page since. I should be back up and running by next week.