"I’m not sure how others do it but this way works for me. The picture tells the story! Mine take around 20 hours to prepare. I preach for about 25 minutes. Some say it seems like 20 hour! I usually start with the Greek or Hebrew text and check it alongside technical commentaries. Then I exegete the text and come up with a rough outline. from there I let it percolated or a few days. I may write some stuff I read the other commentaries (5 or 6 usually). By Thursday the aim is to have a rough draft. Friday morning I re-edit what I have. Depending on the pastoral load this will happen on Saturday. Sunday morning it gets a final run through and re-edit. I never practice a sermon (that is what editing is for). Why do I do this? because its Scripture and God’s word matters as much as his people do. If you wonder when I pray, it is throughout the entire process but more fervently as Sunday approaches!
I’ve never heard anyone regret their pastor taking a long time to prepare but I’ve heard plenty complain when their’s doesn’t prepare enough!"