Half-Life: Alyx by Valve takes about 11 hours to beat the main story, or roughly 18 hours to complete 100%.
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Half-Life: Alyx is Valve’s VR return to the Half-Life series. It’s the story of an impossible fight against a vicious alien race known as the Combine, set between the events of Half-Life and Half-Life 2. Alyx Vance and her father Eli mount an early resistance to the Combine's brutal occupation of Earth.