The fermentatation time really depends on how strong you want your wine to be and if you like it sweet or dry. You need a hydrometer, which usually come with a chart giving the strength and sweetness for a given SG, (some are colour coded) check the SG of your wine priodically and when it reaches the strength and sweetness desired add a couple of crushed campden tablets to kill the yeast and stop fermantation, let it stand and settle for a few days then rack off, filter and bottle, some wines are better for a while in the bottle but most can be drunk almost immediatley.Usually have to make two batches one stopped at medium for the Boss, and one I leave to ferment out for myself as I prefer a dry wine. You can also use your hydrometer to calculate the strength of your wine. Take the SG after you've mixed all the ingredients and keep it some where safe. when you have finished fermenting take it again. Subtract one from the other and devide by 7.36 this will give you the % alcohol by volume multiply this figure by 1.75 which will give you the proof of the drink. Dont ask me where the constants come from I got them from my Berry's wine making book which is available from any decent winemakers site and is excellant for beginners