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No, there is no need to turn off time synch on virtual machines other than domain controllers.
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No, there is no need to turn off time synch on virtual machines other than domain controllers.

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Use the following in an elevated CMD:<br />
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w32tm /query /source<br />
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If the result is IS Time Sync then disable it in the VM's properties.
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Use the following in an elevated CMD:

w32tm /query /source

If the result is IS Time Sync then disable it in the VM's properties.

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I have one physical 2012 R2 Std server which is the PDC Emulator. &nbsp;It gets time from an external source.<br />
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I have one 1xHyper-v Host running 2012 R2 Std server. &nbsp;It gets time from the PDC. &nbsp;<br />
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Its hosts one Hyper-V - VM running 2012R2 Std. &nbsp;It gets time from the PDC Emulator (w32tm /config /syncfromflags:domhier /update). &nbsp; &nbsp;<br />
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It also hosts a &nbsp;2nd Hyper-V VM - also running 2012R2 Std. &nbsp;it is a Domain Controller. &nbsp;It also gets time &nbsp;from the PDC Emulator (w32tm /config /syncfromflags:domhier /update). &nbsp; &nbsp;<br />
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Do I need to turn off Time Sync from Integration Services on both these Hyper-V VMs or just the one thats a DC?
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I have one physical 2012 R2 Std server which is the PDC Emulator.  It gets time from an external source.

I have one 1xHyper-v Host running 2012 R2 Std server.  It gets time from the PDC.  

Its hosts one Hyper-V - VM running 2012R2 Std.  It gets time from the PDC Emulator (w32tm /config /syncfromflags:domhier /update).    

It also hosts a  2nd Hyper-V VM - also running 2012R2 Std.  it is a Domain Controller.  It also gets time  from the PDC Emulator (w32tm /config /syncfromflags:domhier /update).    

Do I need to turn off Time Sync from Integration Services on both these Hyper-V VMs or just the one thats a DC?

Hyper-V: Time Sync on VMs.

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

Hyper-V is a native hypervisor; it can create virtual machines on x86-64 systems and supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks. Hyper-V Server supports remote access via Remote Desktop Connection. Administration and configuration of the host OS and the guest virtual machines is generally done over the network.