How many days can a Kryptonian live on Earth?

In comic books of the late 1930s, all Kryptonians were superhumans with superpowers. In subsequent versions, Kryptonians can only gain superpower by coming to Earth to absorb the energy of yellow sunlight.

In Krypton, which is a galaxy composed of a red sun, the Kryptonians there are as normal as Earthlings. Life (technologically more advanced than Earth). The earth orbits the yellow sun, and the yellow sun reacts with Superman's cells. Superman has since had heat vision, cryobreathing, flight, super strength, perspective, and a body of steel. Similarly, Zod who came to Earth is also super powerful and is even stronger than Superman; Superman's KARA also has the same ability.

: Kryptonians, from DC comics and film and television works, in the DC universe, they are the natives of Krypton, and their representative is Superman.

Reference: Kryptonians