What significant milestone occurred during the first space walk in regards to its duration?

The first space walk, which took place on March 18, 1965, was conducted by Soviet cosmonaut Alexei Leonov. This historic event marked a crucial development in space exploration and human spaceflight. During this extravehicular activity (EVA), also referred to as a space walk, Leonov was outside the spacecraft for approximately 12 minutes. This duration was significant at the time, as it demonstrated the feasibility of humans working in the vacuum of space and laid the groundwork for future missions that would involve lengthy and complex operations outside of a spacecraft. The achievement not only showcased human capability in the hostile environment of space but also provided critical information that would inform subsequent designs and missions regarding astronaut safety and functionality during EVAs.