As many as you can! There is no limit to how much you can earn by referring new GoGetters!
Q: I have shared my unique referral code to 10 friends, but I see this screen. Why is this?
A: You will see this screen if your friends have yet to successfully get trained and become a verified GoGetter. Hurry! Ask them to sign up now. Share them this link on how to sign up to be a GoGetter!