Klainmeister has the right idea. A can or two of concentrate is all it will take.
Unless you use sugar to boost the ABV, apple cider will ferment in a week. It does need to age 3-6 months.
A pound of sugar = 46 points. So, a pound in five gallons adds 0.009 to the gravity and about 1.2% ABV. This is one case where using table sugar isn't a problem, unless you don't like cidery tasting cider.
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