Task: Question Answering
Input (English): Passage: Kett's Rebellion was a revolt in Norfolk, England during the reign of Edward VI, largely in response to the enclosure of land. It began at Wymondham on 8 July 1549 with a group of rebels destroying fences that had been put up by wealthy landowners. One of their targets was yeoman farmer Robert Kett who, instead of resisting the rebels, agreed to their demands and offered to lead them. Kett and his forces, joined by recruits from Norwich and the surrounding countryside and numbering some 16,000, set up camp on Mousehold Heath to the north-east of the city on 12 July. The rebels stormed Norwich on 29 July and took the city. But on 1 August the rebels were defeated by an army led by the Marquess of Northampton who had been sent by the government to suppress the uprising. Kett's rebellion ended on 27 August when the rebels were defeated by an army under the leadership of the Earl of Warwick at the Battle of Dussindale. Kett was captured, held in the Tower of London, tried for treason, and hanged from the walls of Norwich Castle on 7 December 1549. 
Question: How many days were between the time Ketts army set up camp and when the rebels stormed Norwich? 
Answer type: Number 
Output (English): 17.