When are the Pool B picks played?

We could ask you before the season starts to correctly predict the order in which all 16 Survivors are voted off. However, since most people are unfamiliar with the Survivors until part way into the season, this would amount to a random guess and what is the fun in that? Therefore we give you until half the survivors are voted off before Pool B is in effect. Once there are 8 Survivors left, the Pool B picks are tallied.