How long does it take for SSLZEN to validate domain for Premium CDN plugin?

After making the requested DNS changes at Step 2 and clicking "Scan DNS record," propagation typically takes minutes to a few hours, but can take up to 24-48 hours depending on ISP caching and root server TTLs. If it's still failing after 24 hours, contact support@sslzen.com or live chat on sslzen.com.