The Messenger of Allah ﷺ stayed at Tabuk twenty days; he shortened the prayer (during his stay). Abu Dawud said: No one narrates this tradition with continuous chain except Ma'mar.  

أَقَامَ رَسُولُ اللَّهِ ﷺ بِتَبُوكَ عِشْرِينَ يَوْمًا يَقْصُرُ الصَّلاَةَ