The Domain Name record “propagates” as fast or slow as your TTL (time to live) setting is on your A record.
Propagation is not technically correct. It’s cached for the amount of seconds for TTL.
86,400 = 1 day (long)
14,400 = 5 hours (typical)
300 = 5 minutes (short)
Getting ready to change servers? Change it to 300, but remember to set it longer after you’re done.
Don’t want to mess with it? Set it at 14400 (no commas!)
There is a DNS cache on your local computer too, to clear it on windows ipconfig /flushdns
If your computer’s DNS server is OpenDNS, you can clear the Master OpenDNS domain name cache here.