Most writers I know enjoy having written rather than the process of writing. I write a scene a day. If it's beautiful out I try to write in the morning and golf in the afternoon. If it's cold and rainy I procrastinate throughout the morning and write in the late afternoon. I have a computer, a comfortable chair and desk and a view to look at when I'm between paragraphs.
Pacing is a crucial element of a great thriller.
I'm not sure I can explain it. When I plot out a book I know what major scenes I would like to incorporate into the story. I also know what twists and turns I'm planning to make. When I write my outline my pacing is geared to those specific touchstones. Sometimes the story glides along to these turning points.