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How long should it take DNS to propagate throughout the Internet ?

DNS Propogation (the time taken for dns changes to bee seen and used) can be anywhere between 2 minutes and 7 days depending on the frequency that ISPs around the world update their DNS servers, their and your cache settings, wiat systems/devices are providing the dns resolution services etc.

In order to reduce traffic (and therefore cost) MOST connectiviyt ISPs cache DNS results to cut down the number of queries made.
Additionally your machine will cache results for (by default) upto 24 hours

This can further extend DNS resoliution times.

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