I did this last year. It was a 45 minute presentation. I must’ve practiced it at least 30+ times. Most were by myself and a few were in front of a 1-person audience. I stuttered through most of my practice sessions, but when I finally did it in front of the real audience, it flowed out so well… almost as natural as breathing. It was actually pretty amazing and empowering. I had memorized it and built up my confidence so well, I could’ve done it in my sleep. I didn’t stutter a single time and the audience loved it. You can do it, but preparation is very important, especially for us.