For the 8 major planets, the length of the year in Earth
time:
Mercury = 88 days (0.25 Earth years) - 2.9 months
Venus = 224.7 days (0.67 Earth years) - 7.4 months
Earth = 365.25 days (1 Earth year) - 12 months
Mars = 687 days (1.88 Earth years) - 1 year, 2.5 months
Jupiter = 4332.6 days (11.86 Earth years) - 11 years, 10.3
months
Saturn = 10759 days (29.46 Earth years) - 29 years 5.5
months
Uranus = 30799 days (84.3 Earth years) - 84 years, 3.6
months
Neptune = 60190 days (164.8 Earth years) - 164 years, 9.6
months