This is one of my favorite tools, and one that is super easy for even the most beginner-y team to use. The process is simple: each person gets two minutes to say whatever they want to say, and everyone else listens with no feedback or reaction.
The “no reaction” bit is challenging, and I generally don’t worry about laughter, murmurs of encouragement and understanding, and the like. The main thing is to not tell the speaker they are wrong, misunderstand, and the like.
I’m also generally not too strict about the time limit, preferring to let people get out everything they need to. Some people, however, will go on and on for as long as they’re allowed, so I do enforce a limit when I sense this is going on. I’ve never had anyone keep track of time themselves, nor have I had anyone complain when I break in with a simple “Time’s up.”
There’s nothing special about the two minute time limit. I start teams with that because it’s long enough to say something meaningful without being so long it’s intimidating. (Not that there’s any requirement the speaker fill the entire time!) A lot of teams find three minutes works better; a few go shorter, and I’ve never had a team where everyone consistently needed more time. Start with two minutes and see how far beyond that your people tend to go.