It is narrated from al-Hasan al-Urani (may Allah have mercy on him) that a woman was brought to Shurayh (may Allah have mercy on him) whose husband had divorced her; she menstruated for the third time on the thirty-fifth night. He mentioned it in the same way as the hadith of al-Sha'bi (may Allah have mercy on him). Shurayh (may Allah have mercy on him) referred this (matter) to Sayyiduna Ali (may Allah be pleased with him), who said: Ask her neighbours about her; if her menstruation is like this, then her waiting period ('iddah) has ended.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العدد / 15406