For a wine kit, follow the directions to the letter. I believe most kits recommend a secondary / clarification stage (all mine did) at about the 14 day period, when primary fermentation is complete. You will want a secondary to 1)remove the lees (dead yeast) and 2) to make your beer clear. You can also do another racking if you are stll seeing a lot of crap at the bottom of your secondary. Not a bad idea to fill any headspace with CO2, to prevent oxidation.