What is the longest Metroid game?

What is the longest Metroid game? The Metroid franchise has a varying track record when it comes to game length: the longest Metroid game in the mainline 2D franchise is Metroid: Samus Returns (clocking in at around 15 hours), while the Metroid Prime subfranchise’s longest entry is Metroid Prime 2: Echoes (which could’ve taken you 22 hours to beat).

The Metroid franchise has a varying track record when it comes to game length: the longest Metroid game in the mainline 2D franchise is Metroid: Samus Returns (clocking in at around 15 hours), while the Metroid Prime subfranchise’s longest entry is Metroid Prime 2: Echoes (which could’ve taken you 22 hours to beat).
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