I practiced with a speech therapist for 6 weeks or so on an oral presentation I had to give in 8th grade. The presentation was 10 minutes and counted for a good 35% of my grade. We went over every word I would have to say probably a hundred times, and I was able to go in there and do the whole thing fluently. To this day, it's the longest I've ever spoken without a stutter in my entire life.