There is a lot of misinformation and fake hype about Polish-Lithuanian Commonwealth.
Polish-Lithuania Commonwealth at maximum extent - 878,000 km²
Greater Lithuania at maximum extent - 930,000 km²
“Omnis Russia ad Litwinos deberet simpliciter pertinere!” - All of Russia must belong to Lithuania.
Both are impressive on the Peninsula of Europe, not like these countries were surrounded by native savages like in South America. Easy steam-roller conquest for colony like Brazil. Rather in Eastern Europe which was surrounded by war like Mongols , Conquering Islamic Caliphates , and the Holy Roman Empire provocateurs.