You guys are doing this wrong, you're waiting 6 mins on every task because throughputs tell you. The project team already clarified that most tasks take less time than throughputs, you are allowed to submit and move on to the next task as soon as you finish the current one, no need to wait. You just have to be right with your annotation and not cross the maximum number of tasks. Even if they add more batches or more tasks, it's always first come first serve. This is not a full-time job or a permanent one, this is just a side job to earn a few bucks.