Q: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Context: In 1868, Schuyler was a guest of Tolstoi for a week at his estate Link Information: Portions of an earlier version, titled The Year 1805, were serialized in The Russian Messenger from 1865 to 1867 Question: How many years were there between Schuyler's visit and the release of War and Peace?
A:
Answer: 3