It all depends on how I am making the wine. If I am making wine from grapes I usually make 80-100 gallons at a time. If making wine from juice then I usually have 4 or 5 batches going (6 gal pails). If making wine from fruit such as raspberries I make 2 gallon batches. I won't make wine in less than 2 gallon batches. The reason is that I like to try different methods with the wine. For example, if making two 1 gal batches I can slighlty alter the process by adding different yeast and nutrients. I can make one sweet and one dry. I like to take lots of notes so I know what worked and what didn't work for the next time.