the truly hardcore get catheterized and have a pee tube and bag taped to their leg.
I think Strom Thurmon holds the time record, something like 30 hours, set back in 1955, or something —his filibuster was truly amazing, though a couple of our guys also have put in good performances.
Need good shoes, and I think some kind of stealthy leg-brace inside the pants would be good —not sure if it’s allowed, though.