How long does a latecomer (Masbooq) have to sit before standing up to complete his missed Rakaats/s? 

Q. If a latecomer joins the Imaam in the sitting position of Tashahhud and then the Imaam makes Salaam, does the latecomer have to sit for a period of time before making up his missed Rakaats?

A. A latecomer (Masbooq) should recite the Tashahhud if the Imaam completes the Salaah before standing up to perform his missed Rakaat/s. However, if a latecomer does not recite the Tashahhud entirely or partially after the Imaam completed the Salaah, the Salaah will still be valid. (Shaami 1/496)

Allah Ta’ala Knows Best

Mufti Ismaeel Bassa