Omnioutliner import changing duration from hours to minutes in OmniFocus

I’m looking to use OmniOutliner when planning projects with people at work (they love excel so it’s something that makes sense to them)

I then want to import this into OmniFocus so I can manage my tasks.

When I do this it changes the duration from hours to minutes, so if I have a task listed as taking 1 day in OmniOutliner it comes in as 8 minutes in OmniFocus. 2 h in OO comes in as 2 m in OF.

Any thoughts as to what I’m doing wrong?