ENOfficial
The tradition mentioned above has also been transmitted by Qatadah through a different chain of narrators. This version has "nine years". Abu Dawud said: The other narrators mentioned "nine years" from Hisham except Mu'adh.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا عَبْدُ الصَّمَدِ، عَنْ هَمَّامٍ، عَنْ قَتَادَةَ، بِهَذَا الْحَدِيثِ وَقَالَ " تِسْعَ سِنِينَ " . قَالَ أَبُو دَاوُدَ وَقَالَ غَيْرُ مُعَاذٍ عَنْ هِشَامٍ " تِسْعَ سِنِينَ " .
sunnah.com