The more you write the better you get.
Write everyday if you "want to be a real writer."
A real writer is compelled to write when the mood strikes. It doesn't matter what else is happening. A two-year-old on the toilet who needs help wiping? 9/11/2001? When you have the deep writing bug, you write through things that move you and you write because the idea moves you. You can be moved by life to write. You can be moved by ideas to write.
Writing everyday improves your technique, makes you better, makes writing easier and makes you more professional.
When I am truly working hard, I write 5,000 words a day. If I lose interest and force myself to write anyway, I get 1,000. Or maybe 2,000 but 1,000 might be crap that needs to be edited out later.
Lately, I have written a sentence or a paragraph a day. This refers to my fiction project. I have still written in my journal, to my friends and on my blogs. I am still plotting in my head.
Why stress over the word count when I know without a doubt that once I get the plotting right, and I am ready to sit down and write, I'll produce the 5,000 words, probably in one sitting. So, why stress for a week trying to force myself to do something that will effortlessly take a day when I'm ready?
But, please not, I do open the file, read it and write anywhere from a sentence to a paragraph everyday to keep myself engaged and remember what problems I am supposed to be solving.