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Is 51 days as long as The First spaceflight (Sputnik)?

It's about three-fifths as long as The First spaceflight (Sputnik)
The length of The First spaceflight (Sputnik) is about 91 days.
(a.k.a. Sputnik 1, a.k.a. Спутник-1, a.k.a. "Satellite-1", a.k.a. Простейший Спутник-1) (1957) (total time in orbit)
Launched from Kazakhstan in 1957, Sputnik was the first artificial satellite placed into orbit around Earth, where it remained for 92 days. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 0.067 days.
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