It has been recalled through a series of memoirs that Imam during his stay in Najaf used to recite very long narrated supplications at Imam Ali (‘a) shrine in Najaf while standing.
Imam’s disciple recalled that it was a usual routine for Imam to recite Ziarat Jamiah Kabeera and other supplications at the holy shrine.
They said this is while many younger seminary students or scholar could only do this in state of sitting
(A memoirs about Imam and his life)