Impossible to answer due to the numerous factors that would be involved and no two journeys would be the same. However the link below provides information and a video of a journey recently made.
An impossible question to answer as it relies on numerous unqualified / unquantified factors.
The river nile is 6000 kilometers long.
six months
90 days
100 days
They did discover the way to travel underwater.
The great Mississippi river is made entirely of fresh water.
Mississippi River
the Mississippi river
Mississippi river
The Missouri river and Mississippi river both travel through here, giving a lot of water to the land
Mississippi is bordered by the Mississippi River to the west.
The Mississippi River's watershed area, and rainfall.
what body of water does the Mississippi river flow into
Mississippi river
The body of water where the Mississippi river ends is the Gulf of Mexico.
The Mississippi River.