Q: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Passage: Born in Schrimm in the Province of Posen, Wilcke volunteered for military service in the Reichswehr of the Third Reich in 1934. Initially serving in the Heer (Army), he transferred to the Luftwaffe (Air Force) in 1935. Following flight training, he was posted to Jagdgeschwader "Richthofen" (Fighter Wing "Richthofen") in April 1936. After an assignment as fighter pilot instructor he volunteered for service with the Condor Legion during the Spanish Civil War in early 1939. After his return from Spain, he was appointed Staffelkapitan (squadron leader) of the 7. Staffel (7th squadron) of Jagdgeschwader 53 (JG 5353rd Fighter Wing). Following the outbreak of World War II, he claimed his first aerial victory on 7 November 1939. On 18 May 1940, during the Battle of France, he was shot down and taken prisoner of war. After the armistice with France, he returned from captivity and was appointed Gruppenkommandeur (group commander) of the III. Gruppe (3rd group) of JG53 during the Battle of Britain, claiming 10 victories over England.
Link Information: In six weeks from 10 May 1940, German forces defeated Allied forces by mobile operations and conquered France Answer: 6
A:
How long did the battle where Wilcke was shot down and taken prisoner last?