Time is not always that exact with wine, hell if it ferments out in 2 weeks, and it can, you can drink it then. Use your hydrometer to figure out when it is finished. When you get the same reading 3 days in a row, consider it finished. If all you do is add sorbate then backsweetin it may start fermenting again. You will also need to use K-meta as well. It will probably not take 30 days to ferment. I have friends that I make Welches for and drinking it in 8 weeks happens A LOT.
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