… a letter written by Tchaikovsky to his nephew I think. He wrote this letter after he had just spent a fortnight (his words) composing the Nutcracker Suite, which he had thought would only take him 5 days to compose! Can you imagine thinking he had planned to compose all that glorious music in just 5 days and was upset with himself that it took two weeks????
(Hmmm. I wonder how long he planned on taking for composing the entire ballet.)