How much Benny Hill is too much Benny Hill?

I saw a DVD set for the Benny Hill at a local supermarket and noticed that it was 6 hours long.  I thought that even though it wasn't everything by the great Benny Hill it was enough for anyone, be they a fan or not.  This triggered another question in my brain... How much Benny Hill would it tak to drive someone mad?  I'm thinking two hours un-interupted would drive anyone to want to kill themselves.