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A Dell factory worker assembles the laptop by hand, scanning parts as they're built into the system. The whole process takes seven or eight minutes. Desktops, by contract, take three or four minutes to build, while servers can take anywhere from 10 to 40 minutes, depending on the complexity of the system.
The individual who builds a system is considered its 'owner' as it goes down the line, so there's some level of accountability should any defects be discovered in testing.