How long is the longest possible tube ride down the river?

4 to 5 hours long great trip

Very true if you go you will have a great time

It really depends. I have tubed there for the past 3 years and as long as the water levels are not too high there's beautiful sand bars that our group stops at and we make a river trip last 4 hours or longer because we spend more time on the sand bars then we do the tubes. Also depends on current flow.