Many of us leave our beers in primary for 3-4 weeks, skip secondary and bottle. Just search for the 10,000 threads under "long Primary" or "no secondary" and you will see all the resaons why we do it, and the explanations behind...There's at least one thread a day on the topic, so it's really not hard to find the discussion pretty much hashed to death.
but if you choose to secondary you should wait til your
Hydrometer tells you fermentation is complete.
If I do secondary (which is only when I am adding fruit or oak) I wait 14 days then rack for another 2 weeks...then I bottle.
But that's only if I am dry hopping or adding oak or fruit, which I rarely do, so for me it's a month than bottle,
Honestly you will find your beer will be the best if you ignore the kit instructions, and don't rush it.
But Even Palmer says you should wait with kits...
Your beer will thank you for waiting....