You're quoting my post, so I don't know if you are confusing me with Rich? But yes, depending on what you have to start with in that population, it could take quite a while. You need men converted, and then built up with sufficient character and understanding to fulfill the duties of the office, and able to train younger men who can train others, etc. So the missionaries would need to take on that "training others" role for a while until the local group had men mature enough to take over that role. And perhaps you would need a tiered approach for a while, beginning with more basic gospel preachers, and then gradually training them how to repel the more sophisticated kinds of errors (i.e. Pentecostalism, etc.) or refine the translation issues with the Scriptures/Creeds. Jesus sent the 12 Apostles out to preach earlier in their training, but kept teaching them more, before finally appointing them to run the mission in Acts upon his ascension. And even then they still had more to learn...
Paul apparently could start a congregation with Jewish converts or Gentile God-fearers who already knew their Bibles. So it likely did not take as long to find qualified elders who were "apt to teach". But if you have a group that is brand new to the whole gospel message and the Scriptures, it may take awhile before you have men ready to preach the whole counsel of God. I'd be interested in hearing
@Pergamum's perspective on this since that is what he did for so long.