VBoxManage guestproperty set "<vm_name>" "/VirtualBox/GuestAdd/VBoxService/--timesync-set-threshold" 1000
This solution suggested by http://nerdboys.com/2011/03/15/how-to-fix-virtualbox-time-synchonization-problems/
Published April 13th, 2011
I've noticed the system clock in my VirtualBox XP guest is drifting so that after a few hours is can be 30 seconds behind the host OS clock. This VBoxManage command will fix that.
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