Yes, gaman, I agree with the other posts above. But your question was about the time length for sitting out. I once asked someone to sit out for 1 month. This person was on a team that sings every Sunday, so that would be missing 4 times. (The purpose is for the person to evaluate their assignment, get more Word, etc.) I asked her to sit out because she had a serious deficit in committment. When she would come to rehearsals, it was 45 min to 1 hr late, and she would just waltz in with no explanation. She wouldn't communicate her inteneded absences, wouldn't return my phone calls to explain her behavior. She'd call me on Sunday morning explaining that she didn't know if she had the outfit we were wearing that day, and on and on. I gave her a letter advising that she needed to sit out for 4 weeks. She put the letter on my seat and walked out. Pastor said I could have released her permanently when she showed that kind of disrespect to me as the director of music.
I didn't release her at that time. I let her come back after 4 weeks, but she later backed herself into the same situation and was eventually released.