Needwonnee Creek

Hello to all of you! This is my first post. I am an avid reader of the Tasmania forums. I live in Melbourne and spend lots of time walking solo off-trails in Gariwerd/Grampians. I am particularly interested by creeks and water systems. I love wading and following creeks and spend lots of time camping and living next to them. I am preparing a long trip to New River Lagoon late November for my 50th birthday. I am interested to base camp for around 10 days at Cavern camp and explore the surrounding creeks and rivers. Limestone creek interests me very much. I am also very interested to reach the Needwonnee Creek on the Salisbury River by 'walking' along New River. Few accounts (Chapman & Louis-Philippe) mention that it takes approx 2 full days from the lagoon to reach the Salisbury River. Is is realistic? I will be walking solo as this is my preferred way to do and be in the world. Many thanks to all of you for sharing your trips and walks which i am so fond of reading. I ll reach (and leave) New River Lagoon via the South Coast track which is my preferred way.