We got approved a few months ago on a Thursday afternoon, received the NVC welcome email on Sunday night. So very quick! BTW, got approved by NVC less than 2 months after we submitted all documents.
Got the approval from USCIS on Thursday at 6pm. They sent me an email on Sunday afternoon today that they sent the files to NVC. At 7:52pm the same day on Sunday, we received the case number from NVC! I'm very impressed with the efficiency in this step! Good luck to everyone!