If you've got time, then three days would be a very leisurely walk with scenic camping spots at Cooks Beach and Wineglass Bay. Taking the three-day option would spread the walking out a lot and allow you to spend more time relaxing at the beach campsites. However, I felt that two days of walking is the best way to do it. But as I mentioned, I would rather have broken up the days by camping at the saddle instead of staying at Cooks Beach on the first day.