bios.bootdelay = X
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To disable periodic time synchronization in a VM, launch vSphere Client, go to Edit Settings → VM Options → VMware Tools → Time, and deselect the checkbox Synchronize guest time with host
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To disable one-off time synchronization in a VM, you must set the following advanced configuration settings.
time.synchronize.continue = "FALSE"
time.synchronize.restore = "FALSE"
time.synchronize.resume.disk = "FALSE"
time.synchronize.shrink = "FALSE"
time.synchronize.tools.startup = "FALSE"
time.synchronize.tools.enable = "FALSE"
time.synchronize.resume.host = "FALSE"