Why did sergei kirkalyov want to break the record for the longest recored time in space?

Sergei Krikalyov wanted to break the record for the longest recorded time in space to contribute to scientific research on the effects of prolonged space missions on the human body. Understanding how the body reacts to extended periods in space is essential for planning future long-duration spaceflights, such as missions to Mars. Additionally, setting a record can also be a personal achievement and a point of pride for an astronaut.