Slow cooking

I'm preaching next week and I'd love to avoid writing the sermon late in the week.

Normally, the one who is giving the sermon will have the truth of the passage speak into their life much longer than those who are hearing it fresh on a Sunday.

Ideally, the preacher has sat with the passage for at least a week and you could see the application lived out in their lives.

But, i am troubled when you discover that the sermon is written on a Saturday night.

Isn't it much better that the sermon is slow cooked over microwaved?
What message does it send to the congregation if you have only personally been exposed to the message for hours more than those listening?