Beyond everything else, the worst thing I’ve ever been told is ’these days, a normal evangelical church congregation can only handle 30 minutes expository preaching’. Without a shadow of a doubt, this is the most crippling sentence in my memory.
The guy who told me this had a theory - Television programmes are broken down mainly into 30 minute episodes. As most of a congregation will watch the television (though one of prognosis’ bloggers doesn’t. Can you tell which one? I’ll give you a clue - he’s the one that still thinks that Anthea Turner is a welcomed new addition to the Blue Peter team), they’re trained to only take thirty minutes of information at a time. Preachers that go on for any longer will find that the congregation will develope a sudden bout of piles and start moving their butts around on the seat - officially to get comfortable, actually to make clear to the preacher ‘Look! Are you going to get to the point or what?! I’ve got a chicken in the oven, you know!’ 
Or at least that’s how I’ve been interrpreting the bumshuffle ever since I was given the 30 minute golden rule. I don’t think there’s been a week in church where I haven’t been slightly paranoid about causing Mrs. ****’s chicken to chargrill.
So last Sunday night a tough one. I popped down to Ammanford Church to preach at their Welsh language meeting. It’s a big encouragement to ‘go west’ and preach. People from that part of the world are ‘my people’ - we talk the same, dress the same, support the same rugby team - so many of the cultural issues that you’d normally have to deal with are sorted. I felt like Paul going to preach at a Benjaminite home group.
Because of this, I was relaxed and that may have played a part in me hitting 50minutes. It wasn’t like it was an upbeat 50 either - 50 minutes on Psalm 22, the horrors of the cross. I was gutted. I’d broken the golden rule. ‘How could God bless if I’ve gone on for 20minutes too long?’.
Sunday night came and went, I pouted til Monday afternoon, but continued to feel pretty annoyed about it until about Wednesday when I listened to an mp3 of Tim Keller giving a lecture about what an evangelical ministry should look like.
He started explaining that one day, he was reading a translation of Romans 1 that had verse 17 not as the usual ‘the righteous shall live by faith’, but ’he who by faith is righteous shall live’. He said that the moment that he read that, he heard a voice adding ‘and he who by preaching is righteous shall die every Sunday’.
This was a watershed moment, as it was for me, hearing him say it all in light of preaching for so long the Sunday before. Keller explained how for so long during his ministry, though he confessed Christ as his righteouness, his ‘functional righteousness’ was in fact his preaching. So, when he preached well, he would think that God must be for him, and that when he preached badly, he would think that God was against him.
This was a real eureka moment for me. I saw that my functional saviour had become ‘the 30 minute rule’. Stick to it and God will bless, break it and God cannot. Totally against the truth. Totally against grace. It’s all of grace, whether God blesses or not. I want to live (and sleep like a Calvinist), I want Jesus as my rightousness, not my preaching.