Not following.
Why is 1/1 not = 4 and 1/3 = 6? If 1 hour per day was spent on a task between 1/1 and 1/4 inclusive (4 days) then it ought to be a total of 4?
Also, 1 hour spent on task 1 on 1/3 + 3 hours on task 2 on 1/3 + 2 hours spent on task 3 = 6. You didn't show a grouping on task, but by date, so I get different totals.
If this is related to employment situations, have you considered that a date range might go over days where work isn't done, such as on days off? That's another can of worms.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.