Rbps

Officially there's only one supervisor review, but if it takes longer than 6 weeks and you call and inquire, they usually answer like let me flag your case once more for supervisor review or they are still reviewing it. This, however wouldn't add 6 more weeks.
 
Make sure you speak to them calmly and not yell at them, no matter how frustrated you are. I know it is easier said than done, but yelling at them will get you no where.
 
Good luck. Wish you get your response CC soon .

Give them 4 weeks, and then start calling them twice a week until you get the result. Usually as per NVC, supervisor review time limit is 6 weeks.