"Mr. Clement is admired by colleagues and adversaries for the straightforward clarity of his presentation. He famously argues without notes, leaving his hands free to jab and gesticulate, sometimes as if wringing an imaginary neck.

'He just internalizes every single aspect of the case,' said Viet D. Dinh, Mr. Clement’s law partner. 'He makes the argument not from memory but from total immersion.'"

The Supreme Court will hear five and a half hours of arguments on the health care law.  The typical allotment is one hour of arguments.  NPR lists other lengthy arguments here.

Bush v. Gore - ninety minutes

Gibbons v. Ogden - twenty hours

McCulloch v. Maryland - nine days

United States v. Nixon - three hours

New York Times v. United States - two hours

Brown v. Board of Education I - eight and a half hours

Brown v. Board of Education II - six and a half hours

Miranda v. Arizona - six hours

South Carolina v. Katzenbach - seven hours