It's because according to what was agreed to by this committee, every one hour the Bloc will get six minutes. Then the Bloc gets 2.5 minutes and another 2.5 minutes after that.
When we have a full two hours—not two separate hours—the Bloc is given the extra six minutes in a second round to make up for that.
This time you had two six-minute rounds. In the first round in camera, and in the first round in the second hour, the Bloc got six minutes.
But that's not the issue. The issue is that the interpreters have to leave at a certain time. Given that we'll probably be going just over that time, any amount of time we take off means that we'll have to end without somebody finishing their time as it is.