Apologies if this is in the wrong bit or has been asked 16 thousand times before.

But as I trudge through my first draft, I'm having an impending sense of doom about the point at which I'll have to go back and review it.

I'm enjoying the draft process, just taking it 500 words a day, but I wondered how do other people draft? Do you review and rewrite every couple of thousand words or so? Or do you all wait until the end and then start hitting delete?