How much time I need to spend on visiting Border Abbeys, south from Edinburgh? [closed]

I want to do an extensive car trip through Scotland next year in June and I started to gather information and plan it in time.

Particularly, one of the areas I am looking at is south from Edinburgh. I've read a book and listed such places:

• Rosslyn Chapel
• Melrose Abbey
• Scott’s View
• Dryburgh Abbey
• Mellerstain House
• Dawyck Garden
• Kailzie Garden

Out of first 4, which ones would you suggest as worth visiting? How much different are they from one another (abbeys, gardens)? How much time would I need to visit them (excluding transit)?

Preferrably, we'd want to spend 1 full day in the area, so we need to pick best spots out of the list. What would you suggest?

Assumptions:

• we have a car
• we are not afraid of walking all day long