A week just doesn't seem to be working for me. This relationship was very sudden to me because I probably occured so subtly over a long period of time. You have to think when Tonks and Remus met, too. They could have met when she was much younger while Remus was friends with Sirius. More likely, they met before OotP. Their relationship develops and hits a head at the end of HBP. Tonks probably wouldn't have gotten so desperate in public if Dumbledore hadn't died. So, they could have gone on with the awkward/avoidance stage for a quite a while. It seems that Tonks and Remus were avoiding each other around Christmas time, too, and it could have been going on from the moment when she first told him she liked him. This could make the awkward/avoidance stage up to about a year long.
What I'm doing right now is the awkward/ avoidance stage. But that will only last for about a week until Remsu realizes that he can't resist. Then he goes all noble.