The AWS Network Firewall service quota limit for stateful rules is now adjustable. The default limit is still 30,000 stateful rules per firewall policy in a Region, but you can request an increase up to 50,000. This firewall rule limit increase helps customers strengthen their security posture on AWS and mitigate emerging threats more effectively.
A higher rule limit provides flexibility to customers with large-scale deployments to define their firewall policy with different combinations of AWS managed and customer defined rules. Starting today, you can implement a broader range of rules to defend against various threats and scale as you grow on AWS.
Source:: Amazon AWS