How many people need to have davened to recite chazartz hashatz. Also must they have started at the exact same time.
Answer:
Six people who are davening, may join with another 4 to complete the minyan for chzaras hashatz. Even if they didn’t start at the exact same time, but at some point were all davening Shmoneh Esrei together they may say chazaras hashatz.
Sources:
MIshna Brura 69:8, Shu”t Maharshag 4:148, Shu”t MInchas Ytzchak volume 1:57, Biur Halacha 69:1 s”v Omer
