In trying to sort it out, because it does tend to be a problem sometimes, and it is difficult for you to control it.... But given that it is an issue we all would like to see resolved a bit, is it possible for you to tell each witness to please be specific, to the point, and to try to keep their answers to within two minutes--something along those lines?
It's not easy for you to do that, though, because you're going to have to remind them continually to try to keep their answers to two minutes, and there are times when they're going to have to exceed that, which would be the exception.