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The watch system adopted in the engine room is usually a four-hour period on duty followed by eight-hour rest. The word “watch” means both the period and the crew working at that time. The three watches in any 12 hour period are usually: 12 to 4, 4 to 8, 8 to 12. Thus, for instance, an engineer on duty for the 8 to 12 watch works from 8 a.m. to 12 noon and from 8 p.m. to 12 midnight.