Does it help or hurt if I say I wrote 16K between Monday morning and Wednesday evening?! (Clearly I can only keep that rate up for a few days: but it can be done, especially if you stop worrying about quality.)

My personal 50K deadline is Saturday morning, because (a) I think it's going to take a couple more thousand words, and (b) I need to spellcheck and tidy up the worst bits and send it off to somebody ...