How long is a season on mercury?

Answer 1

Mercury has no seasons, and would not have them even if it were Earth-like (which it is not). This is because it does not have a tilt as great as Earth has, compared to its orbital plane.

However, Mercury also has no real atmosphere. And most places on the surface experience 88 Earth days of searing heat followed by 88 Earth days of incredible cold. So there is no temperate zone to experience a yearly cycle of seasonal temperatures based on changes in the solar angle.

Answer 2

22.75 days each.