A passage from 'Working':
And these writers provided more for me than merely the glow of their names. In my memory, no one spoke to me for the first few days I was in the room. Then one day, I looked up and James Flexner was standing over me. The expression on his face was friendly, but after he had asked what I was writing about, the next question was the question I had come to dread: “How long have you been working on it?” This time, however, when I replied, “Five years,” the response was not an incredulous stare. “Oh,” Jim Flexner said, “that’s not so long. I’ve been working on my Washington for nine years.” I could have jumped up and kissed him, whiskers and all—as, the next day, I could have jumped up and kissed Joe Lash, big beard and all, when he asked me the same question, and, after hearing my answer, said in his quiet way, “Eleanor and Franklin took me seven years.” In a couple of sentences, these two men—idols of mine—had wiped away five years of doubt.
[0] Caro, Robert A.. Working (p. 76). Knopf Doubleday Publishing Group. Kindle Edition.