There are two sets of RJ Spagnols instructions depending on which brand is being made. Some have a 14 day primary (as Repsolal has suggested), and others a 7 day ferment (as stated by gmorandin). This is why it is very important to tell us what kit EXACTLY that you are making.
Fortunately RJS only makes one Tempranillo Cabernet (as opposed to the 9 Merlots), and it is in the Cellar Classic Winery Series. This is one of the 7 day primary brands.
So 7 days in primary, then transfer to secondary, and then wait till day 28 to do the additives.
BTW, gmorandin, this is NOT a 28 day kit (ie 28 days to bottling). RJS considers it a 42 day kit.
Personally I would wait to the 28 day point (or longer) before continuing. This allows more of the sediment to settle, and these kits can be bad for sediment due to the grape skins.
Steve