It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that he said: Sayyiduna Ibn Rawahah (may Allah be pleased with him) estimated it at forty thousand wasq, and he stated that when Ibn Rawahah gave the Jews the choice, they took the dates (themselves), and twenty thousand wasq (of the Muslims' share) became due from them.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14017