I’m going to assume that this is a new link you have with a recruit.
The way the rewards work, is that 8 days after your recruit adds game time, you get one reward. Then every month thereafter, you continue to eat a reward as long as they keep adding game time too.
If your friend added 6 months of game time, you’ll get the first 6 rewards, one month at a time.
Do note, your account must also be active to qualify for the reward.
Details can be found in the support article here: