In my case it was 6 months between sending off my initial application and sitting in the classroom at IANS luxembourg. From what i read on these boards thats a lot quicker than NATS. But its all a question of dates really because i think they do selections every couple of months; but they only have 2 courses a year...i suppose it just depends where your interview falls in the scheme of things and if they've filled up the next course.
i can remember being asked in the interview if i had applied to NATS, which i hadn't, but i've heard of people failing the NATS selection and still getting accepted into eurocontrol....errr... i've also heard of people failing eurocontrol selection after failing NATS.
Good luck!