Sometimes in TPRS I have felt like I need to go the whole period on a story without stopping. This is a false idea. Sometimes, it may happen because the class is so engaged and time just flies. Most of the time, the class needs a break about every 10 – 15 minutes. These little brain breaks keep it fresh, so the students can come back ready.
Here are some things I have tried so far. I may have them turn to their study buddy and talk in L2 about a character, do a little retail, do some TPR, go on a CI tangent about something else. Whatever it is, it just gives them a break from what you are doing. It is important to remember that the talking they do in L2 to their partner may not actually lead to acquisition, but what it does do is make them feel apart of the learning and apart of a club.
The only thing is that I have to remember to give the breaks. Often times I can forget, but I pay for it later when the class runs out of cognitive steam.