Oates has never run her writing life on a clock-punching schedule, yet the pattern is clear once you read the interviews. She is a morning writer who would rather skip breakfast than break a good run.

The Direct Answer
In the morning, often before breakfast.
She has described loving to write before breakfast and working intensely from roughly 8:30 to 1, per her Paris Review interview and a 2001 USA Weekend profile.

Before Breakfast, For As Long As It Lasts

When the Paris Review asked Oates about her habits, she pushed back on the idea of a rigid timetable and described something looser and more obsessive instead.

I haven't any formal schedule, but I love to write in the morning, before breakfast. Sometimes the writing goes so smoothly that I don't take a break for many hours, and consequently have breakfast at two or three in the afternoon on good days.

Joyce Carol Oates, The Paris Review, The Art of Fiction No. 72

That is the engine of her famous output. Most days she is at the page early, and on a good one the morning simply swallows the rest of the day. A 2001 USA Weekend profile put a clock on it, with Oates saying she tries to write in the morning very intensely, from 8:30 to 1. The breakfast detail isn't a throwaway. When the work is going, she lets a meal slide to two or three in the afternoon rather than break the concentration, which tells you which one she treats as negotiable.

There's no mystique to the timing. The morning is simply when she protects her mind, before the day's noise has a chance to crowd in. The rest of her hours can flex. The morning can't.

Teaching Days Are Different

Oates taught at Princeton for decades, so most of her writing life ran alongside a classroom calendar. She didn't let teaching cancel the writing. She just shrank it to fit.

On the days she taught, she told the Paris Review, she usually wrote for an hour or forty-five minutes in the morning, before her first class. It's a small window, but it ran for years and produced shelves of books. The lesson isn't the length of the session. It's that the session happened at all, every working morning, teaching or not.

It's worth sitting with how unusual the math is. Oates has published close to a hundred books across her career, and most of them were drafted in those guarded morning hours, plenty of them squeezed in before a class. The output looks superhuman from the outside. The schedule behind it is almost boringly steady.

For the wider picture, see the full Joyce Carol Oates writing routine.

What You Can Steal