I did my Eurocontrol-tests in Norway.
Sounds strange with all the waiting.... When I did my FEAST1 I got the result via e-mail a few hours later..
After stage 2 I got the response after 2 days.
The final "your'e admitted" message came - I think - about 5-6 days after my interview.
/TH
PS: Just to clarify, I'm training with Avinor not NATS.