Your issue is probably related with a not properly configured Security Group, that does not allow the connection between both systems.
Could you check if your EC2 instance security group allows outbound access to the mount target on the NFS, and if the NFS mount target security group allows inbound access from the EC2 security group?
Anyway, I recommend that you take a look at the Amazon Elastic File System (EFS) user guide, since it details how troubleshoot most mount issues, including your timeout error, as well as DNS name resolution fails.
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