OMNIPLAN export to xml
 

I am having a little difficulty exporting xml files for use in MS Project. After export of omniplan file to xml, I try and import with MS Project. This does indeed import, however all of my durations default to hours rather than the required days.

It seems to be that OmniPlan is exporting to xml or MPX (either gives the same result) - is there something that I can change in settings that stops this happening?