It takes about 7 days from the time the fermentation starts to the time the collection of the pure alcohol is complete. During this period the amount of time involved in actually doing something with one's hands is probably no more than 3 or 4 hours. Periodically it is necessary to check a temperature or change a collection bottle but, to a large extent, the operation carries on quite happily by itself. It is not possible, therefore, to assign a cost to labour and we shall not attempt to do so here. In any case, being a hobby, it should be a labour of love!
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