Reading a HuffPost blog by Steve Ross, former president, Collins Division at HarperCollins and Sr. VP, Crown Division at Random House I found this, which I hope inspires you to find the time, find the time, find the time, find the time each day for your writing.
"Between midnight and 3:00 am each day--after his Senate and family obligations were put to bed--Barack would write, then send his work to his editor for her comments. As the deadlines grew tighter, she would give us regular updates about the progress of the manuscript and sometimes share drafts of chapters for a few of us to read. It was a rare pleasure to watch as the distillation of his message and his vision took shape on paper. Even as a senator Barack continued to care about his work as a writer."
You can read the full article at http://www.huffingtonpost.com/steve-ross/the-writer-in-chief_b_342242.html -- but not til you're done writing for today!