Our Pastor will select an area he wishes to explore, it may be one book, or a topic. Our Pastor may give the message on one Sunday, or it could be a series that takes months. Typically, our Pastor will talk for about 45 minutes and the entire service usually runs about an hour and 40 minutes.
Sometimes the service will run longer if Christians are being baptized.
Have you ever read the paradoxes and problems by the poet John Donne?
I hope you will see the humor in his consideration of why Puritan preachers preach so long. His final conclusion is that they are preaching until everyone wakes up.