Great question — answering as the UphillTech team:
Possibly Certainly there is some evidence/corroboration that the movie ran in some theaters for periods of a year or more and so the quote by the authors may be taken at face value The screening recalled the glory days of the 1960s Hollywood epic, when films were presented like plays, with reserved seats. The movies were always preceded by an overture and included a perfectly placed break for an intermission. “Doctor Zhivago” played in exclusive runs in major cities that lasted a year or more. The huge downtown theaters that booked the film only showed it once or twice a day. Source
Full answer by Paulie_D: https://movies.stackexchange.com/a/104777 (CC BY-SA 4.0).
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