This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: Jonas was busied in conferences and Augsburg ) and visitations during the next twenty years, and in diplomatic work with the princes. In the autumn of 1531, Jonas published a German translation of the Apology of the Augsburg Confession and in 1541 he began a successful preaching crusade in Halle, becoming superintendent of its churches in 1542 or 1544 and priest in the Market Church of Our Dear Lady the city of Halle, Saxony-Anhalt. Martin Luther became severely ill and visited his friend during Christmas in 1545. Jonas was present at Luther's deathbed at Eisleben, and preached the funeral sermon; in a procession Luther's body was taken to Halle and buried in Wittenberg. In the same year Jonas was banished from the duchy by Maurice, Duke of Saxony. From that time until his death, Jonas was unable to secure a satisfactory living. He wandered from place to place preaching, and finally went to Eisfeld, Thuringia , where he died, aged 62.
Question: How many years after Jonas published his German translation of the Apology of the Augsburg Confession did he begin preaching in Halle?
Answer type: Number
10.