The prodical son did not have to wait three months to a year be accepted back into his fathers house, did he? Why not?
No, he did not have to wait three months to a year. He humbled himself to point of willing to take the job of a slave. He showed repentance. JWs disfellowship unrepentant sinners.
Paul stated that the majority who rebuked the wrongdoer was enough.I don't believe he made that distinction. Certainly those Christians would have respected Paul's authority within the Christian congregation and not challenged him by associating with the wrongdoer. Obviously they did respect the arrangement, that's why Paul wrote his Second letter with instructions to accept the wrongdoer into the congregation.