Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:2557al-Miqdām b. Dāwud > ʿAlī b. Maʿbad > ʿUbaydullāh b. ʿAmr > ʿAbdullāh b. Muḥammad b. ʿAqīl > Kānat

[Machine] "The turmoil lasted for five years for Al-Hasan ibn Ali, and from that, four months. And the group was with Muawiyah for forty years."  

الطبراني:٢٥٥٧حَدَّثَنَا الْمِقْدَامُ بْنُ دَاوُدَ ثنا عَلِيُّ بْنُ مَعْبَدٍ ثنا عُبَيْدُ اللهِ بْنُ عَمْرٍو عَنْ عَبْدِ اللهِ بْنِ مُحَمَّدِ بْنِ عَقِيلٍ قَالَ

«كَانَتِ الْفِتْنَةُ خَمْسَ سِنِينَ لِلْحَسَنِ بْنِ عَلِيٍّ ؓ مِنْ ذَلِكَ أَرْبَعَةُ أَشْهُرٍ وَكَانَتِ الْجَمَاعَةُ عَلَى مُعَاوِيَةَ سَنَةَ أَرْبَعِينَ»