I cannot always write at the same time, in the same place. I work, travel and have a vigorous family life. If I'm stranded in an airport lobby - I write. If I have to wait in a doctor's office - I write. If I have a morning or evening to myself - I write.
You're more likely to finish a book you enjoy, than one that feels like literary drudgery.
I find that it takes a lot of years of living, and many more of reckoning, to come up with one worthwhile paragraph. And when a deadline looms, prayer doesn't hurt, either.
Listen to great storytellers; slowly, you will learn about voice, timing, tension, structure, climax - all the things you need to tell stories that will capture the imagination of your audience.
There are constant cycles in history. There is loss, but it is always followed by regeneration. The tales of our elders who remember such cycles are very important to us now.