Question: Great Minquas Path was a trade route starting from a river which is how long?

Context paragraphs:
Pennsylvania Route 162: Pennsylvania Route 162 (PA 162) is a 10.1 mi state highway in southeast Pennsylvania.  The western terminus of the route is at the PA 82/PA 82 in Unionville, Chester County.  The eastern terminus is at U.S. Route 322 Business (US 322 Bus.)  in West Chester.  PA 162 is known as Embreeville Road from its western terminus to the village of Embreeville and Telegraph Road from Embreeville to an intersection with the Strasburg Road one mile (1.6 km) west of Marshallton.  At this point, the route turns east, following the Strasburg Road to US 322 Bus.  in West Chester.  The portion of road between Marshallton and West Chester follows the 17th-century "Great Minquas Path" and became part of the Strasburg Road linking Strasburg and Philadelphia in the 1770s.  PA 162 was designated onto its current alignment by 1930.

Trade route from the Varangians to the Greeks: The trade route from the Varangians to the Greeks (, Russian: Путь из варяг в греки, "Put' iz varjag v greki" , Swedish: "Vägen från varjagerna till grekerna" , Greek: Εμπορική Οδός Βαράγγων – Ελλήνων ) was a medieval trade route that connected Scandinavia, Kievan Rus' and the Eastern Roman Empire.  The route allowed traders along its length to establish a direct prosperous trade with the Empire, and prompted some of them to settle in the territories of present-day Belarus, Russia and Ukraine.  The majority of the route comprised a long-distance waterway, including the Baltic Sea, several rivers flowing into the Baltic Sea, and rivers of the Dnieper river system, with portages on the drainage divides.  An alternative route was along the Dniestr river with stops on the Western shore of Black Sea.  These more specific sub-routes are sometimes referred to as the Dnieper trade route and Dniestr trade route, respectively.

Rennsteig Cycle Path: The Rennsteig Cycle Path (German: "Rennsteig-Radwanderweg" ) follows for 195 km the Rennsteig trail that has existed at least since the Middle Ages as a courier and trade route.  Most of this long distance cycle path is carefully ballasted, although parts of it also run along quiet country lanes.  On the crest of the Thuringian Highland the cycle path is identical for long stretches with the hiking trail of the same name, but departs from it in places so that steep inclines can be avoided.  It starts at Hörschel west of Eisenach and ends in Blankenstein by the River Saale.

Trade route: A trade route is a logistical network identified as a series of pathways and stoppages used for the commercial transport of cargo.  The term can also be used to refer to trade over bodies of water.  Allowing goods to reach distant markets, a single trade route contains long distance arteries, which may further be connected to smaller networks of commercial and noncommercial transportation routes.  Among notable trade routes was the Amber Road, which served as a dependable network for long-distance trade.  Maritime trade along the Spice Route became prominent during the Middle Ages, when nations resorted to military means for control of this influential route.  During the Middle Ages, organizations such as the Hanseatic League, aimed at protecting interests of the merchants, and trade became increasingly prominent.

Great Minquas Path: Great Minquas Path (or The Great Trail) was a 17th-century trade route that ran through southeastern Pennsylvania from the Susquehanna River, near Conestoga, to the Schuylkill River, opposite Philadelphia.  The 80-mile (130 km) east-west trail was the primary route for fur trading with the Minquas (or Susquehannock) people.  Dutch, Swedish and English settlers fought one another for control of it.

Volga trade route: In the Middle Ages, the Volga trade route connected Northern Europe and Northwestern Russia with the Caspian Sea, via the Volga River.  The Rus used this route to trade with Muslim countries on the southern shores of the Caspian Sea, sometimes penetrating as far as Baghdad.  The route functioned concurrently with the Dnieper trade route, better known as the trade route from the Varangians to the Greeks, and lost its importance in the 11th century.

Eselsweg: The Eselsweg (English: "donkey trail") is a long-distance hiking trail that follows an ancient trade route through the "Mittelgebirge" Spessart, in the states of Hesse and Bavaria, Germany.  It is 111 km long and leads from Schlüchtern in the valley of the Kinzig river to Großheubach on the river Main.  The trail follows an ancient trade route on which donkey caravans used to transport salt, thus giving rise to the name.

Susquehanna River: The Susquehanna River ( ; Lenape: Siskëwahane) is a major river located in the northeastern United States.  At 464 mi long, it is the longest river on the East Coast of the United States that drains into the Atlantic Ocean, via the Chesapeake Bay.  With its watershed, it is the 16th-largest river in the United States, and the longest river in the early 21st-century continental United States without commercial boat traffic.

Trapper's Trail: The Trapper's Trail is a north-south path along the eastern base of the Rocky Mountains that links the Great Platte River Road at Fort Laramie and the Santa Fe Trail at Bent's Old Fort.  Along this path there were a number of trading posts, also called trading forts.  It was an important trade route for animal trappers and fur traders in the North American fur trade from about 1820-1846.

Birkenhainer Strasse: The Birkenhainer Strasse (English: "Birkenhainer road") is a long-distance hiking trail that follows an ancient trade route through the "Mittelgebirge" Spessart, in the states of Hesse and Bavaria, Germany.  It is 71 km long and leads from Hanau to Gemünden am Main, cutting across the so-called "Mainviereck", a large loop of the river Main.  The trail follows an ancient trade route which in the Middle Ages was an important road for moving troops and for long-distance trade.  The "Birkenhainer Strasse" was a part of the link between Nuremberg and Antwerp.  Its origins may lie back as far as the Neolithic period.  The name likely derives from a prominent copse of birch trees that used to exist near the road at Geiselbach (Hesse).

Supporting paragraphs: Great Minquas Path Susquehanna River
Answer: 464 mi long