Hi there,
The timing for receiving an email after a referral can vary, but generally, McKinsey takes anywhere from a few days to a week to review and send the application link. It’s possible they are still processing referrals or checking the internal systems for alignment with your profile.
If it’s been more than a week and you haven't heard anything, it’s okay to follow up with the person who referred you. You can politely ask if there’s anything further needed from your side or if they could check in with HR for an update.
Good luck, and feel free to reach out if you need more advice!