My understanding from reading manufacturers manuals is that time is an equal element to mileage for oil life. Thus on my former gasser I changed every three (? could have been 4) months regardless of mileage. If I changed before storage and it sat in storage for the lilfe of the oil, I changed it before going on the road. Oil, even a professional oil change, is CHEAP next to possible engine trouble.
On my present Freightliner/Cummins setup it is an annual oil change unless I should happen to run 15,000 miles first, seems unlikely.