Source text
وَمُنْتَفِخٌ مِنْ ثَلَاثَةِ أَيَّامٍ وَلَيَالِيهَا إِنْ لَمْ يُعْلَمْ وَقْتُ وُقُوعِهِ
• If the carcass is swollen or decomposed and the time is unknown, the matn applies three days and three nights under Imam Abu Hanifah's precautionary position.
• The commentary connects the longer period to swelling being evidence that the carcass has been there for some time.