My husband(70) and I(65) Have seven weeks (from mid October to early December) to do New Zealand as thoroughly as possible and then some highlights in Australia. We plan to rent a car (or cars) for New Zealand. I plan to do some reading, but was wondering if you could help with ideas about how long it will take to do the north island and how long it will take to do the south island. It would help with our car rentals and our flight booking to Australia. Thank you!