This depends on the type of reward you received.
Coupons:
If you received a coupon link, it will be valid for 30 days.
Reloads:
If you received a reload, this will only be active for 5 days in total.
For an explanation on the different types of rewards you can receive, you can refer to this article.
If you have any questions or need further clarification, please don't hesitate to reach out to our Customer Support Team. We're here to assist you 24/7.