How long did the sputnik mission last?

The Sputnik mission, specifically the first satellite, Sputnik 1, was launched on October 4, 1957, and it remained in orbit until January 4, 1958, when it re-entered the Earth's atmosphere. The mission lasted a total of 93 days in orbit. Sputnik 2, which carried the first living creature, a dog named Laika, was launched shortly after on November 3, 1957, and remained in orbit until April 14, 1958.