I had a wheel motor seal kit(on one of the motors, not both) installed on a 2002 Great Dane Chariot w 440 hours. The dealer(from whom I purchased this tractor from, and many others) is charging me for 6.9 hours of labor. This seems very high to me, especially since I could have purchased a new motor for less than the $436 repair bill. How long should this job take to do by a competent mechanic? Thanks.