It is reported from Sa'id bin al-Musayyib (may Allah have mercy on him), concerning the story of the Bedouin who had intercourse with his wife in Ramadan, that he said: A basket of dates was brought to the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Take this and give it in charity." And he mentioned it (i.e. the long hadith). Ata' (may Allah have mercy on him) said: I asked Sa'id (may Allah have mercy on him) how many dates were in that basket. He said: Between fifteen and twenty sa'.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15702