When adding segment to a list, age in days do not allow to specify the number of days but the date.

When adding segment to a list, age in days do not allow to specify the number of days but the date.

There is something I think is a bug on zoho segment creation: when chosing List Added Time with reference to "Age In Days" it doesn't allow me to specify the number of days but rather asks for a date, which is not compatible. 

Does someone knows how to change this field to work correctly? I already reported to Zoho Support but it is still not working!