I assume you are asking about a 2019 return. It takes approximately 45 days after the friend (a new TurboTax customer) redeemed the offer you sent them by preparing their TurboTax return through the link you had sent them.
Read more about the details here:
FAQ: Learn about the TurboTax Invite-a-Friend programs
https://ttlc.intuit.com/community/tax-topics/help/learn-about-the-turbotax-invite-a-friend-program/0...
