"The Iqamah for Zuhr prayer would be said, and a person could go to the Al-Baqi', relieve himself, perform wudhu, and come (to the masjid), and the Messenger of Allah ﷺ would still be in the first rak'ah, making it lengthy.
لَقَدْ كَانَتْ صَلاَةُ الظُّهْرِ تُقَامُ فَيَذْهَبُ الذَّاهِبُ إِلَى الْبَقِيعِ فَيَقْضِي حَاجَتَهُ ثُمَّ يَتَوَضَّأُ ثُمَّ يَجِئُ وَرَسُولُ اللَّهِ ﷺ فِي الرَّكْعَةِ الأُولَى يُطَوِّلُهَا