Comparing two dates within different columns and rows

Artemio , You can have new column

Date diff =datediff([start date], [enddate], day)

then create a column rank

rankx(Table, [Datediff],,desc,dense)

or

Rank Measure

rankx(allselected(Table[Date created], table[week], table[Point id]) ,calculate(Sum(Table[Date diff])) , ,desc, dense)

For Rank Refer these links
https://radacad.com/how-to-use-rankx-in-dax-part-2-of-3-calculated-measures
https://radacad.com/how-to-use-rankx-in-dax-part-1-of-3-calculated-columns