I think it's at your discretion, Chair.
If I might build on that, I would go as far as saying that, in the event Ms. Duncan has something perfectly important to say, I think the question of substitutability might even go between parties. If there's a feeling that Ms. Duncan has not had a chance to finish her line of questioning and has something particularly probative to ask of witnesses, I don't see why we would be precluded from having one member say they'd like to give two minutes or some of their time to any member of this committee. I think the idea that each member is able to come to this committee and be active is important.