http://www.computing.net/windows2003...orum/3231.html
Quite a few respones concerning this issue at computing.net
Some say that if it is not over 10 minutes, consider it normal.
But I think the below might be your problem:
Check your DNS server configuration. It might not configured properly to resolve hosts record. Open the DNS console. See that you have a zone with the same name as your AD domain . Ck that within it you have the 4 SRV record folders.(_msdcs, _sites, _TCP,& _UPD )They must exist.
Five minutes to logon is considered long.
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