If the zodiac is equally divided, which constellation does the sun stay in for the shortest time? Which is the longest?

The longest is Gemini, because the earth's revolution speed at perihelion is the slowest at this time, and the sun is in Gemini in the zodiac, so it has the longest time in Gemini.

The shortest is Sagittarius, because the earth revolves fastest at perihelion, when the sun is in Sagittarius of the zodiac. So the time in Sagittarius is the shortest.