Background: Sutcliffe was born in Bingley in the West Riding of Yorkshire to a working-class family. He was given a Catholic upbringing by his parents, John William Sutcliffe and his wife Kathleen Frances (nee Coonan). Reportedly a loner, he left school aged fifteen and had a series of menial jobs, including two stints as a gravedigger in the 1960s. Between November 1971 and April 1973, Sutcliffe worked at the Baird Television factory on a packaging line.
Context: West Yorkshire Police were criticised for being inadequately prepared for an investigation on this scale. It was one of the largest investigations by a British police force and predated the use of computers. Information on suspects was stored on handwritten index cards. Aside from difficulties in storing and accessing the paperwork (the floor of the incident room was reinforced to cope with the weight of the paper), it was difficult for officers to overcome the information overload of such a large manual system. Sutcliffe was interviewed nine times, but all information the police had about the case was stored in paper form, making cross-referencing difficult, compounded by television appeals for information which generated thousands more documents.  Assistant Chief Constable George Oldfield was criticised for being too focused on a hoax confessional tape that seemed to indicate a perpetrator with a Wearside background, and for ignoring advice from survivors of Sutcliffe's attacks, and several eminent specialists including the FBI, plus dialect analysts such as Stanley Ellis and Jack Windsor Lewis, whom he had also consulted throughout the manhunt, that "Wearside Jack" was a blatant hoaxer. The investigation used it as a point of elimination rather than a line of enquiry and allowed Sutcliffe to avoid scrutiny, as he did not fit the profile of the sender of the tape or letters. The "Wearside Jack" hoaxer was given unusual credibility when analysis of saliva on the envelopes he sent showed he had the same blood group as the Yorkshire Ripper had left at crime scenes, a type shared by only 6% of the population. The hoaxer appeared to know details of the murders which had not been released to the press, but which in fact he had acquired from his local newspaper and pub gossip. The official response to the criticisms led to the implementation of the forerunner of the Home Office Large Major Enquiry System, the development of the Major Incident Computer Application (MICA), developed between West Yorkshire Police and ISIS Computer Services.  In response to the police reaction to the murders, the Leeds Revolutionary Feminist Group organised a number of 'Reclaim the Night' marches. The group and other feminists had criticised the police for victim-blaming, especially the suggestion that women should remain indoors at night. Eleven marches in various towns across the United Kingdom took place on the night of 12 November 1977. They made the point that women should be able to walk anywhere without restriction and that they should not be blamed for men's violence.  In 1988, the mother of Sutcliffe's last victim, Jacqueline Hill, during action for damages on behalf of her daughter's estate, argued in the High Court that the police had failed to use reasonable care in apprehending the murderer of her daughter in Hill v Chief Constable of West Yorkshire. The House of Lords held that the Chief Constable of West Yorkshire did not owe a duty of care to the victim due to the lack of proximity and therefore failing on the second limb of the Caparo test.
Question: How long did it take for the police to catch Peter Sutcliffe?

Answer: