The dealer has a labor hours schedule for each job by which the mechanic is paid. That's what they gave to you. The mechanic will fix it in less hours but you won't know when he starts or if he works on it continuesly. What they quoted you is total allowable labor hours

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas