going back over 50 years..my pal's older brother was d/f for adultery, we had to shun him, he seemed to stay out for years.
the brother that conducted studies with my mum and dad--and seperately with me--as a kid.....also had a study with a young married couple his own age.. long story short--he ended up shagging the wife, both fessed up and were d/f for it. husband divorced the wife. they were shunned--but after a year were reinstated and married.
i dont think shunning made a scrap of difference. the first mentioned chap was putting it around--and going to casinos--smoking--living the high life. no intention of going back--not till years later
the adulterous couple merely served their time and were reinstated and welcomed back with open arms.