That's the point I was asked in late 1999 to sort out a show stopper problem at one of the exbibits at the millennium dome. Took me about 2/3 of a day but only

That's the point I was asked in late 1999 to sort out a show stopper problem at one of the exbibits at the millennium dome. Took me about 2/3 of a day but only about an hour of programming the rest was spent thinking and sketching out the problem and test cases on paper. Program ran first time and ran with 100% uptime for the duration