In any event neither "4 hours" - nor "heat after death" is adequate - these are thermal excursion which are far from self-sustaining.
Of course, there is no real definition for what this parameter needs to be - but in the context of a reactor having significant thermal insulation - at least 24 hours and probably a week would be needed to please most observers. From: Jed Rothwell Rossi has never demonstrated in public an ECAT that is truly self sustaining. Yes, he did. He ran for 4 hours with no input. Wrong. His cell was connected during this time. He claimed the connection was "minimal" or some such excuse - but no one ever got to test it.
