Aaron Bennett February 4, 2012 Aaron Bennett February 4, 2012 I pastor a large church and have a large staff, and so I give special prominence to preparing the sermon. I give it 15–20 hours a week. I would not advise younger ministers to spend so much time, however. The main way to become a good preacher is to preach a lot, and to spend tons of time in people work—that is how you grow from becoming not just a Bible commentator but a flesh and blood preacher. When I was a pastor without a large staff, I put in six to eight hours on a sermon. — Tim Keller, on preaching Aaron is the pastor of Spring of Life, a new church in Portland, Oregon. He's the owner of Amplify Creative.