Oh, and the reason for so much time in Tasmania is that its on my life list of places I must visit, along with the pyramids, palau, temples of cambodia, myan ruins, the tatchenshini, easter island, great wall, rio, & victoria falls. Images of all of these places have left significan marks on myself and need to be viewed in person. Tasmania, pyrimids, & palau most of all.
Just thought i may add that Tasmania is a wonderful place to visit, make sure you allow two days for Port Arthur. The entry ticket for Port Arthur settlement is valid for two days so you may as well make the lost of it and make sure you do the ghost tour of a night, this can be great fun. The caravan parks all the way around are excellent with fantastic backpackers facilities as well as camp kitchens. I have travelled all over australia and i must admit that Tasmania has the very best camping facilities that i have seen.
Enjoy your visit to our fantastic country.