I have learned that these are more "guidelines" than hard and fast "code," as it were. Especially should a guest need something, as per the Rule of St. Benedict, they speak as oft as needed. And many times a Sister or two will need to do work between Breakfast and Terce and must speak to other people or animals. One of the more humorous parts of this to me is that in fact, many of the Sisters are near deaf and so if something is communicated, it is actually at a much louder volume than the average "inside voice" which sounds positively like yelling when interrupting periods of observed silence. It's great, it really gives the whole thing character and I'm pretty sure God finds it endearing and funny, too.
What I have found is that unless the balance of the Benedictine tri-focus of study, prayer and work remains in symbiotic balance, the life is simply monotony- in the acedic (yeah, I just made it into an adjective) sort of pointless sense- or ruthless, in the legalistic, workaholic sense, you know, like with the Trinity, if we over or under emphasize, He becomes different from who He is. Like I said before, this is just sort of the built-in stability of the Monastic Life, not that there isn't temptation to overdo one or the other but I suppose that is why they ruthlessly pray "save us from the time of trial/lead us not into temptation" 6 times a day, eh? Or at least in part.