[Machine] Ibn Abbas used to say about menstruation: "You should perform one washing for both Dhuhr and Asr prayers, and another washing for Maghrib and Isha prayers." He also used to say, "You delay Dhuhr prayer and perform it closer to Asr, and you delay Maghrib prayer and perform it closer to Isha."
كَانَ ابْنُ عَبَّاسٍ يَقُولُ فِي الْمُسْتَحَاضَةِ تَغْتَسِلُ غُسْلًا وَاحِدًا لِلظُّهْرِ وَالْعَصْرِ وَغُسْلًا لِلْمَغْرِبِ وَالْعِشَاءِ وَكَانَ يَقُولُ تُؤَخِّرُ الظُّهْرَ وَتُعَجِّلُ الْعَصْرَ وَتُؤَخِّرُ الْمَغْرِبَ وَتُعَجِّلُ الْعِشَاءَ