Erratic time issues on Hyper-V based RHEL guests running ntpd

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Issue

Erratic time issues on Hyper-V based RHEL guests running ntpd.
Why is time on my RHEL guests under Hyper-V behaving erratically?
Why is time on my RHEL guest under Hyper-V skipping randomly?

Environment

Red Hat Enterprise Linux 5 (RHEL) running as a virtual machine on a Hyper-V host.
ntpd

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