The closest I've come to playing 15 rounds over one course in a short period was probably during the grow-in of High Pointe, when we played the back nine most evenings. So, this is a bit of a foreign question to me.
If limited to England, I would probably want to do the exercise at Rye, to see if it is as good as I think it is.
St. Enodoc or Brancaster would also be a wonderful choice. Woking or West Sussex would be a fine option, too, if choosing a non-links.
I think for choosing one course for daily play, I would be more conscious than ever of wanting a couple of "extreme" holes where par is exceptionally difficult, so that I could see how well I could sort it out after multiple plays.