Abdullah bin Shaqiq said: I asked Sayyidah Aishah (may Allah be pleased with her): Did the Prophet (peace and blessings be upon him) use to pray the Duha prayer? She said: No, except when he (peace and blessings be upon him) returned from a journey.
(b) Mu'adhah narrates from Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) used to pray four rak'ahs and would add as much as he wished.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4912