“They sent me to Zaid bin Khalid to ask him about passing in front of one who is performing prayer. He told me that the Prophet ﷺ said: ‘Waiting for forty is better than passing in front of one who is performing prayer.’” (One of the narrators) Sufyan said: "I do not know if he meant forty years, months, days, or hours."
فَأَخْبَرَنِي عَنِ النَّبِيِّ ﷺ قَالَ لأَنْ يَقُومَ أَرْبَعِينَ خَيْرٌ لَهُ مِنْ أَنْ يَمُرَّ بَيْنَ يَدَيْهِ قَالَ سُفْيَانُ فَلاَ أَدْرِي أَرْبَعِينَ سَنَةً أَوْ شَهْرًا أَوْ صَبَاحًا أَوْ سَاعَةً