About tasks | scheduled time and marking a member

About tasks | scheduled time and marking a member

Hi all,
As you can see from the picture. I just created a task and marked to a member besides I gave it a start and an end date but my questions are:

Why it shows that it passed 11 hours in spite that i gave this task to be started at the same day on next couple hours?!
Another question , what is the benefit of marking a member? Is it to be assign automatically when the start schedule begins?

thanks
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