it take 6 weeks from USCIS to NVC, then you can call in NVC and ask if they received your package, make sure ask when they received so you can count from that day to 2 weeks to get the case number.
after you get the case number then you can wait 3 days to paid your first fee then another 3 days to pay the next week then you mail your documents to NVC.
when they received it then you can count up to 5- 11 weeks for case completed.
some people get case completed in 3 weeks so I wish you good luck.