Appreciate that Paul and it makes sense to have a consistent standard. I hear you about not cutting it too fine which is exactly why I need to understand the rule. We have done a lot of travel in the last four years and my wife a little more. She will be OK on the "ATO interpretation" but not on any other (i.e. one or both of entry or departure date counting as a day out of country).
Do you happen to be able to point me to any official reference that confirms this? I checked the Australian Citizenship Act and there is nothing in there. So I guess its more of a generic definition.
Thanks again.