From what I have seen in the testimony, he does have a lot of cases. I don't know the complexity of the cases. Not all cases are equal. Some cases can be resolved in 30 seconds with a phone call. Others may take longer. But he does have a significant number of cases. I believe that when he was here last week, he testified to having cases in the thousands.
On June 1st, 2009. See this statement in context.