DNS change propagation times depend on the time-to-live (TTL) setting for the DNS record.
The default TTL is one day, which means any modifications to a domain name take one day to propagate throughout the entire internet. TTL can be lowered if you plan to make changes frequently, however, the lower the TTL is, the higher the load becomes on the name server. Higher loads have a potential to increase the response time to end users, which could impact their overall satisfaction.
The higher the TTL setting, the higher DNS performance will be due to local ISP caching. The lower the TTL setting, the lower DNS performance will be due to increased name resolution.
To verify TTL, check the Start of Authority (SOA) record for the domain. A great tool for reviewing domain information is offered by CentralOps.net
TTL is listed in seconds.Divide by 60 to convert TTL to minutes, or by 3600 to convert to hours.