Do you have any idea how long you speak for? Not from the pulpit if you have such an edifice, really or metaphorically, but in meetings and discussions. Most people who love the sound of their own voice underestimate, when asked to guess, how long they speak for. I know one person who always contributes to meetings in five minute chunks. The idea of getting a one sentence intervention out of him (it is a him) is cloud cuckoo land.
Next time you have a meeting ask someone to time the length of the contributions. It may surprise people. Or you?
You may have to introduce a guest for some reason in order for this to happen and, it goes without saying but I will say it anyway, that if you tell people why the guest is there it will change behaviour.