You sit there waiting for the RED LIGHT to go on. You could be sitting there for five minutes, waiting, while the producer talks to the engineer. Then the light goes on you know that you mustn't make a mistake for at least 4 minutes. ↗
The thing I hated about it was that you live in your trailer all the time and then they call you and you do maybe two dozen lines. Then they do that for three hours and you wait and wait and wait, and I don't like waiting. ↗