I'm consultant of a factory that produce fiberglass structures for minning, like stairs, grids, floors, railings. They may receive an idea or an engineering draw. Every project is different in time, complexity, tools assistance, manpower. Sometimes need one worker others two, three...ten. Of the 100% of the manhours they hired, only 60% can be allocate to an especific project. The waste of time between projects is unknown or not measured. The productivity varies in every shift.
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