minimum number of ayahs in salaah

As-salaamu-alaikum
i require clarity on the minimum number and lenght of ayats of surah to be recited after surah fatiha in salaat (is only ayaatul kursi-1 ayat – adequate
Jazakallah

may u be granted a long , pious and healthy life to continue fulfilling a much needed service to the ummah and mayu be fully rewarded for your effort.