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LONDON, Oct 30 (Reuters) - A turnaround at BP's 430,000 barrel per day Whiting refinery is expected to last six to seven weeks into the middle of November, BP's head of investor relations said on Tuesday. The maintenance work at the refinery involves a crude unit, a coker and a sulphur treatment unit, according to Chief Financial Officer Brian Gilvary. (Reporting By Ron Bousso and Shadia Nasralla; Editing by Kirsten Donovan)