The Asheville Citizen-Times reported the state doesn't have a precise timetable for clearing rocks from the slide, which occurred about 2 a.m. Sunday.
Highway engineer Joel Setzer with the North Carolina Transportation Department says the original estimate of three months probably is unrealistic.
Crews cleared rubble from the eastbound lanes Tuesday and used a tractor-mounted hammer drill to break up some of the large boulders at the base of the 200-foot-wide slide.
Blasting could start Wednesday.
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