I've been writing 15-20+ hours each week for the last couple of weeks, most of which is new material. It's more than I usually write, and even as I'm writing it, I know that some of it is crap. In the last week, I've killed off a character then decided he couldn't die, given another one polio then decided she couldn't have it, and decided that an invisible character needs to remain invisible, like Carlton the doorman from Rhoda. Sometimes I cut and paste the scene into a "deleted scenes" file on my computer. Sometimes I just highlight the whole thing and delete it. Gone forever.
I'm just plugging away, getting my ideas and revisions down on paper (or my more accurately, on my computer) while I have the time.
I just printed out 30 pages of new text and now I'll edit. I actually love this part, because this is where my story stops being crap and starts evolving into the story it wants to be. I'll need to revise it, change the sequence of events, improve the dialogue, describe the setting better, etc.