Passage: Starting in 1954, Oppenheimer lived for several months of the year on the island of Saint John in the U.S. Virgin Islands. In 1957, he purchased a 2-acre (0.81 ha) tract of land on Gibney Beach, where he built a spartan home on the beach. He spent a considerable amount of time sailing with his daughter Toni and wife Kitty.

Question: How many acres did Oppenheimer purchase?
2-acre