DoubleSnake C-Star will take 5-6 days to produce around 14% alcohol if you use 6 kgs of sugar (normal white sugar) in a total volume of 25 litres (top up with water, nothing else). You can also use Brewing Sugar - that is slightly better for purity but you need to use 6.5 kgs instead for the same result. Best fermentation temperature (air temp) is 22-25 C.