Is it a year the same for all planets?

No, a year is not the same for all planets. A year is defined by the time it takes for a planet to complete one orbit around the Sun, which varies significantly based on its distance from the Sun and its orbital speed. For example, a year on Mercury lasts about 88 Earth days, while a year on Neptune takes about 165 Earth years. Each planet's unique orbit results in different lengths of a year.