Timing

So my testimony that I'm giving on Tuesday is supposed to be 17-20 minutes long. I went out to the lake to say it out loud once so I could time it. Here's a screenshot of my stopwatch:

Winning.

I've resisted practicing it out loud very much. I might regret that later, but it's too late now. I've been over it and over it so many times in my mind, it's pretty close to memorized. Isn't that funny? It's my story, how much do I really need to practice saying it?