We'd need to know what model of truck your International is (International makes Class 5 through Class 8 trucks), as well as what your transmission is... if you're running, say, a 4400 with an Eaton six speed, the time involved will be a lot less than if you had, say, a ProStar with an Autoshift transmission.
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It would depend greatly on what size the truck is. Need more info on truck and drivetrain.