If things are going well I can easily spend twelve hours a day writing, but not writing writing, just thinking and revising and taking a comma out and putting it back in.
For any writer, the ability to look at a sentence and see what's superfluous, what can be altered, revised, expanded, and, especially, cut, is essential. It's satisfying to see that sentence shrink, snap into place, and ultimately emerge in a more polished form: clear, economical, sharp.
A work of art can start you thinking about some aesthetic or philosophical problem; it can suggest some new method, some fresh approach to fiction.
I can no more reread my own books than I can watch old home movies or look at snapshots of myself as a child. I wind up sitting on the floor, paralyzed by grief and nostalgia.
Long before the idea of a writer's conference was a glimmer in anyone's eye, writers learned by reading the work of their predecessors. They studied meter with Ovid, plot construction with Homer, comedy with Aristophanes; they honed their prose style by absorbing the lucid sentences of Montaigne and Samuel Johnson.
And there was that trick he did with time, making it speed up when we were together and drag til I saw him again.