All are in length (90–91 days, depending on leap years).
The longest season is summer, but not in the way you might think. In the Northern Hemisphere, summer typically begins on June 20 or 21 (summer solstice) and ends on September 22 or 23. This duration can vary slightly from year to year due to the Earth's elliptical orbit around the Sun. what is the longest season
Earth is farthest from the Sun (aphelion) in early July, so it moves slower during Northern Hemisphere summer, making that season longest. In the Southern Hemisphere, their summer occurs when Earth is near perihelion (January), so their summer is actually the shortest season. All are in length (90–91 days, depending on leap years)