With the theme that every change breaks someone's workflow*, my workflow has it that I usually run my Debian partition in a real environment, but sometimes I have to run Windows, so when that's the case I run my Debian partition as as VirtualBox guest. I expect this conflict against ntp will mean that my clock will drift on days/weeks where I'm not running Windows. My personal preference would be for a different solution...
Peace, Brendon *And, as per https://xkcd.com/1172/ , I await your response of "That's horrifying." :)