Honestly, some days I spend all day not-writing. I don't mean periods when I don't have time to write, I mean when the word processor is open, the plot is outlined, the special mood music is playing and then I get up to check the mailbox, make another cup of tea, fiddle with cover art or whatever.
Eventually I've been awake 14 hours and have achieved nothing, and I type like crazy for about 2 hours to get my words done.