DNS change has propagated on my ISP, but not my clients. Please help.

I changed the name servers on a clients domain to a new server. They are unable to check their POP mail because the DNS change has propagated through my ISP. They however are still reaching the old web server.

Mine has been propagated for about 24 hours now. There's still has not. Is this unusual? What's the maximum time any ISP provider will take to propagate new changes? They use DSL, they really need to access their email but cannot.

In the meantime, I am forwarding any messages to an alternate account for them.

 

 

 

 

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