Yes, you can create two time slots in the day and set up a different price for them if you want to.
Yes, it is possible by setting the related option in YITH Plugins->Delivery Date->Settings-> Show DatePicker.
Yes, this is possible. You can use the Quantity table option for that, which allows setting up different prices not only based on the selected quantity but also based on the delivery date.
If you just want to use the turnaround option without the quantity selector, you’ll just have to set up one row with quantity 1.
This is how it might look like:
Yes, of course you can. Just make sure the processing days is set to 0.