How long does the light for Gemini reach to earth?

Gemini is a constellation and different stars in Gemini are different distances, so there's no fixed time. Unless you're using another meaning of Gemini?
Gemini is a constellation, not a star. It is made up of many, many stars, at different distances.
Gemini is a constellation, not a star. It is made up of many, many stars, at different distances.
Gemini is a constellation, not a star. It is made up of many, many stars, at different distances.
Gemini is a constellation, not a star. It is made up of many, many stars, at different distances.