few planning questions

Starting to plan trip to png just a few questions.
1 how many days should i need for a tour of highlands.
2 how many days for a sepik tour.
3 any cheaper way to get around than flying or can i get any discounts .

I've been researching those same questions. I was told that you can tour the Sepik river in seven days. I've also found out that PMV (private motor vehicle) is the cheapest way to get around. Try this website for additional information.

Papua New Guinea Travel