* Seasons vary in length: Seasons are based on the Earth's tilt and its orbit around the sun. The length of each season can vary depending on your location on Earth.
* We need to know which seasons: Are you asking about 3 seasons in a row, or 3 seasons in total?
To answer your question, tell me:
* Which three seasons are you talking about? (Spring, summer, fall/autumn, winter)
* Where in the world are you thinking about? (Different places have different season lengths)