I do not want to be a spoilsport, but when official representatives are invited to appear before the committee for a two-hour hearing, they are expected to be present during the entire hearing.
Before consenting to this request, I would like to know the reasons for it. When we put questions, a certain momentum builds up. Now, without a crystal ball, we cannot tell what will be relevant and what will be irrelevant during the second hour. I would like to know what circumstances can justify a witness not being present during the entire hearing.