The whole concept of "date due" does not take account to how people work today. The reality is people would take a card or a task, schedule time for that card/task, then focus.
Would be be interested in a Trello feature where cards have "schedule time" in 30 minute units? The same would work for checklist in the card.
That would allow someone to schedule 30 minutes each day until the task is completed.
Thoughts?
I'm using the Cronofy power-up which somewhat does what you're looking for. You may want to give that a look.