Grin,
My wife and I write as a team, We usually get in two days a week where we go to the local cafe (Live Internet and good food) and knock out whatever we need to get written for the most recent deadline. Most of what we write is equal parts caffeine and pastry. Of course we usually spend more than we expect to earn, from the work. The money is only a way to keep score any way, if we had to live from what we sell we would starve.
Regards,
Kevin
ps the worst part of writing is waiting for the publishers to send the tax information every year.