There's a project under submission right now, though. And if it sells, it may mean the equivalent of NaNoWriMo. 70,000 words to be written over the course of two months. That's cranking it.
When you are working under contract, it's always hard to know whether to be satisified, whether you've done enough. At one end, you know you need to have a book. But during the course of a single day, you know you can't write that whole book. You can only write a piece of it. So it's learning how to write enough each day that at the end, it all wraps up. Even when you account for sick days and bad days, holidays and crazy days, days when you spend your time polishing what you've written before and your word count actually goes down.
I've managed this before. But it's still daunting to think about.