How many rak'ahs are there in the Duha prayer and what is its evidence, and is it prayed two by two?

The minimum for Duha prayer is two rak'ahs, and there is no text that specifies its maximum. However, it is established that the Prophet (peace and blessings be upon him) prayed it four rak'ahs, and he added as many as he wished. He also prayed it eight rak'ahs on the Day of the Conquest of Mecca.

The preponderant opinion is that there is no specific maximum number for it; rather, a person prays as many rak'ahs as they wish, provided that the prayer is performed two by two.