" After a couple of hours of intense work, I look at the paragraph I’m struggling with and know that it will be easier to finish it tomorrow. Other writers who talk about their routines usually make the same point—three or four hours a day is about the maximum that can be expected. "

― Charles Murray , The Curmudgeon's Guide to Getting Ahead: Dos and Don'ts of Right Behavior, Tough Thinking, Clear Writing, and Living a Good Life