Here is another excerpt from Power in the Pulpit.
Disciplined study habits will be enhanced greatly if the preacher’s time and location for study are protected…. Well-meaning members of the congregation inevitably will come by to visit for a few moments, which often stretch into an hour or more. A better situation is to have your study in a secluded place, away from the traffic flow.
Some men use an out-of-the-way place at the church as a study. Or, if an extra room is available and your church leadership is agreeable, use a room at your house. There you will be away fro the activities at the church. – pg. 84
So let me get this straight, the pastor should cut himself off from the flock he should be leading, for the sake of a 30 minute sermon on Sunday morning? His chance to personally edify and encourage people should be avoided because it could be too time consuming? Also, who is the “church leadership” that might prevent the pastor from studying in his own home?