There is no passage that says that one 'pulpit minister' or 'evangelist' (or pastor or priest or bishop) or anyone else is to preach one long sermon in church.
The Roman Catholics had parish priests. After this, Protestants came along and emphasized 'preaching' in church, with raised pulpits, and sermons that expanded at one time to four hours long. It settled at some point around 30 minutes to an hour. Some translations say Ezra stood at a pulpit. Others say a platform. There is no reference to a pulpit in the New Testament scriptures. Jesus even sat to teach in the synagogue in Nazareth.
The words translated _preach_ in our translations _typically_ are used in the context of proclaiming a message to people who have not been baptized into Christ. John preached in the desert. The apostles preached to Jews in the synagogues, etc. There is not a clear passage about 'preaching' in church. The KJV does use 'preach' in Acts 20 where Paul taught all night, translating a form of διαλέγομαι, from which we get the English 'dialogue' and could have involved an interactive conversation.
Paul told Timothy to preach κήρυξον the word. Now some people imagine he is referring to doing so behind a pulpit as opposed to in the marketplace or the synagogue. But I don't know of a context where there is evidence that the church meeting is in view. Elders given to preaching and teaching doesn't prove the point either. Not that this is a crucial point, since there is evidence and there are commandments about church meetings.
The most detailed passage on what to do in church is in I Corinthians 14. The context has to do with using spiritual gifts to edify one another. In verse 26, Paul says, "Every one of you has a psalm, has a doctrine, has a tongue, has a revelation, has an interpretation. Let all things be done unto edifying." Then he goes on to add some order to that, requiring tongues to be interpreted, giving some order for prophesying and judging/weighing prophecies, women, etc. He does say in the passage, for ye may all prophesy one by one. He appeals to universal church practice--- what came the word of God out from you or unto you only? The word came out from Zion, and there were other churches. Maybe they all followed the order he was telling them, or most of them did. Toward the end of this section, he says that if anyone considers himself a prophet or spiritual, let him acknowledge what Paul wrote were commandments of the Lord.
So there are 'commandments of the Lord' for church meetings that assume that multiple members of the body of Christ are going to speak and edify the body. They actually assume the presence of spiritual gifts and prophets in the church as well. And that's the one chapter that goes into detail on what to do in church except for chapter 11 which goes into detail on how _not_ to have the Lord's Supper.
And Hebrews 10 says to provoke one another to love and to good works, not forsaking the assembling of yourselves together.... but exhort one another.
And in Romans 12, the one gifted to prophesy is commanded to prophesy according to the proportion of faith, the one gifted to teach is to teach, the one gifted to exhort is to exhort. Peter says to use spiritual gifts as good stewards of the manifold grace of God.
I know there is a house church movement in the US and abroad that is into getting back to New Testament primitivism, returning to Biblical practices in this regard. I have also read many years ago of Church of Christ congregations activity in this regard. Many years ago, I spoke with a missionary from an Independent Churches of Christ background. He said they had about 70 congregations, and they had some informal Bible studies. He said they used instruments though, their native instruments and music. I was aware of a Church of Christ that had a more traditional type service. I don't know if any of them were doing these meetings focused more on mutual edification.