The Sixth Trial- a bonus one- lasted for approximately two and a half hours, which was more than Arthur had expected. Since there was no time limit, the remaining twelve participants were able to pass, fortunately for them. The number of blobs of light was equivalent to the number of participants so there really was no reason for the teams to fight and wear themselves out.
Arthur's declaration was heard by every one of them so they knew that, with John gones, their chances of completing the Sixth Trial is no less than a hundred percent.