You can always just take a grav reading at 3 days... if it is close to the FG you can just follow those instructions. I usually let my dry hopped beers go 11-14 days, or more depending on how big of a beer it is, then do my dry hopping.
The recipe states that you DH in the primary then transfer to the secondary. This seems useless to me personally. If you are going to throw hops into the primary just leave them in their until you bottle.
I say unless you are just really impatient then drag out the fermentation a little. Let it sit in primary for a couple weeks. If you have a secondary then just rack on top of your dry hops, if not then just throw them in the primary for however long, i guess really 10 days in the recipe. Then bottle. Even if the hops havent settled some will stick to the sides of the fermenter, others may make it into the bottle but these will drop out into the yeast cake and wont cause any problems. It has happened to me and the hops stay in the cake and i get no "vegetal" flavors from the hops.
Good luck and no matter what you do, you can learn somethings and hopefully drink something tasty!
Primary: SMaSH-Galaxy/Crisp Maris Otter,SMaSH-Topaz/Fawcett Halcyon,Bohemian Bulldog Steam Beer,Causeway Kolsch
Secondary: SMaSH-Rakau/Crisp British 2Row Pale
Bottled: HeftyWeizen,La Flama Blanca Pepper Wit,DunkelRyeZen,Big League Brew Wheat IPA