The answer
Typically 5 minutes to 1 hour for new records. Changes to existing records depend on the TTL (5 min for testing, 1 hour for production). Full global propagation can take up to 24 hours. Check with dnschecker.org or whatsmydns.net.
Configuring DNS Records for AWS EC2 A Records, CNAME, and Subdomains
How long does DNS propagation take?
More FAQs in Configuring DNS Records for AWS EC2 A Records, CNAME, and Subdomains
First allocate an Elastic IP and associate it with your instance. Then create an A record in your DNS provider: Type A, Name @ (for root) or api (for subdomain), Value (your Elastic IP). Verify with dig yourdomain.com A +short.
The default public IP changes when you stop and start the EC2 instance. An Elastic IP is a static IP that persists across stop/start cycles. Without it, your DNS A record would point to the wrong IP after a restart.
Create an A record: Type A, Name api, Value (your Elastic IP). Then add an Nginx server block with server_name api.yourdomain.com and the appropriate proxy_pass or root. Finally, get SSL with sudo certbot --nginx -d api.yourdomain.com.
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