NASA saw Rossi’s device and claimed that it didn’t run long enough to rule out non-nuclear sources. The problem is that their requirements for how long it runs in self-sustain mode are completely arbitrary. Basically, no chemical reaction can run in that mode for more than a few minutes, and Rossi’s runs for 6 hours. NASA chose 8 hours as the cutoff point.
Basically, no chemical reaction can run in that mode for more than a few minutes,That is the most ridiculous thing you've ever said on the subject, and you've said plenty of ridiculous things.
Your statement that "no chemical reaction can run in that mode for more than a few minutes" is not only wrong, it's ridiculous. His later gadget has a hidden volume of 30 liters, and he spent hours pumping heat into the gadget prior to the "start" of the dog & pony show. It would be trivial to fake his results under those conditions.
Also, since it's supposed to be a nuclear reactor, he ought to be able to run it for months at a time. For his October 6th test, he promised that he would let it run at least 12 hours. But then, after only 4 hours, he shut it down.
There is no actual evidence that the E-Cat can run more than 4 hours, in spite of all of Rossi's extravagant claims.