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a)Idle running (without grinding operation and materials) 3-7 hours.

b)Install 1 / 3 of the grinding operation of 3-5 hours.

c)Install 2 / 3 of the grinding operation of 5-10 hours.

d)Install 5 / 6 of the grinding operation of 10-12 hours.

e)Load all the grinding operation of 15 hours.

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