How Many VPC Peering Connections Can I Create in an Account?
Each account can have a maximum of 50 VPC peering connections in each region by default.
Number of VPC peering connections that you can create in each region between VPCs in the same account: subject to the actual quota
Number of VPC peering connections that you can create in each region between VPCs in different accounts: Accepted VPC peering connections use the quotas of both accounts. To-be-accepted VPC peering connections only use the quotas of accounts that request the connections.
An account can create VPC peering connections with different accounts if the account has enough quota.