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: 16 March 1781, she acted as repeating frigate. She was not with the fleet during the battle of the Chesapeake on 5 September, but joined it, still off Cape Henry, on the 14th, and was left to keep watch on the movements of the French till the 25th, when she sailed for New York Link Information: took place near the mouth of the Chesapeake Bay on 5 September 1781. Question: How long had the battle of Chesapeake been going on by the time the HMS Pearl made it to Cape Henry?
Answer: 1