Assuming you're a US citizen and your NCE-JFK flight arrives reasonably on time, you should have no problems. The last few times I arrived at the 2-3pm hour at JFK (when the NCE flight arrives) - the most recent being just last week, there were no lines at all in the immigration area for US citizens and I got through immigration within 5 minutes. Even when the area was packed, I have never spent more than 15-20 minutes going through immigration in the US line.