The Short Answer
The changes of a domain should be completed within about 60 seconds.
The Long Answer
When you update your domain in the Dashboard, it can take up to 48 hours for those updates to propagate throughout the Internet. While we strive to make updates as quickly as possible, the DNS propagation time for your domain name depends on several factors that we cannot control.
What is DNS propagation?
When you make a DNS change, it takes time for the changes to take effect. This is called DNS propagation. It is the time it takes for the domain DNS to refresh the cache on the network.