Hi Leo,
You can use an IF statement to check if the fields are filled, and then only show the days if they are.
Something like this:
IF(AND({Listed}, {Sold On}),DATETIME_DIFF({Sold On},{Listed},'days')&" Days")
Or if you wanted to show something instead of blank, you can do this:
IF(AND({Listed}, {Sold On}),DATETIME_DIFF({Sold On},{Listed},'days')&" Days", "DATES NOT SET")
Cheers :slightly_smiling_face: