Calculation between 2 dates based on the same value

MathieuF 

There's no task.expired_from_workbin in your data,  only task.expired_from_step??

Had a quick look (see it all at work in the attached file). The measure seems to work fine for cases like ID

541fe1360f4ca114df0000bc

but is slightly off at ID

        56e1917d7765624c6b0001fd

because task 5fcfa098bd0e54813b1340de     appears in two instances ( taken-completed, resume-completed)

and yields negative numbers at cases like ID

       4fc675c20f4ca11924008111

where the code works well but the data only has  a task.taken for  taskID 5fd0b96871336830f56f98f2, which messes the result up

Dealing with those cases will be trickier but the code can give you a good start. In any case you will need to exactly define all of the possible cases in which the data can appear and, equally important, define how to deal with them

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Cheers