I've been thinking a lot lately about what the appropriate length of a sermon should be.
In seminary we were taught that 12-18 minutes was a good length, and anything longer than that was pushing it. The style that I was taught in seminary usually involved the Scripture being read before the sermon. The preacher had selected one thought from the Scripture and then developed a manuscript which he or she read from the pulpit.
The style that I like the best is more of a teaching style sermon. I like to have people open their Bibles and follow along and turn to different passages. This style seems to take a little longer, at least 20 minutes, maybe up to 35-40. I know some people that use this style preach 50-60 minutes.
The preaching style of most growing churches that I'm aware of is the teaching style even though it takes longer. I don't know of any growing church where the sermon is less than 20 minutes long.
I'm also finding that most mainline churches are acclamated to the style of preaching that I learned in seminary. I'm praying about my approach to preaching and trying to listen to how God is calling me to shape my sermons based on the needs of my congregation.
I'd be interested to get other people's feedback about appropriate sermon length.