Hello KP,

You can achieve this by setting "max_unit" attribute in the dictionary of Remaining Effort field.

1.Right click on duration field.
2.Goto configure dictionary.
3.Click advance ui action under related links.
4.Add max_unit=days in the Attribute field.
5.save the record.

Let me know if you have any question.

Hit Helpful or Correct on the impact of response.
-Tushar