It's up to you. If it was my first brew I would literally follow the directions. These days and knowing my preference probably not.
If the primary is still very active, I would assume some flex in the instructions and let it ride. Then as soon as it begins to slow rack to secondary on top of the 3-5oz of sugar.
There are so many differing opinions on cider and how it should be done. Some people leave it 3-4 days, rack it, and actually change vessels 3-4 times. Others do a secondary, some people never remove it from the primary.
My choice is almost always to let the primary go 10-14 days, or until fermentation has slowed a lot. If you look in my sig you can click on that recipe, and you will see an example of my style. Basically I like to aim for a specific gravity, and then rack to a secondary to finish out whatever my ultimate goal is. For a dry or hot cider you let it run a long time going for low gravity. For a sweeter cider you can wait a few days for some clearing to happen and than bottle.
You really need to experiment with a few batches using the same recipe and feel out what is right for you.