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I checked and it is on this Thursday night on the regular National Geographic channel at 10 PM. You can check on their website for more showings but that is the one at the most normal hour.
I scheduled my cable recording (DVR) for Thurs and found about 4 hours of successive NatGeo Ultimate Factories shows. I don't have the link but looked at Thurs' scheduling as posted above and found the additional shows; Lambo, Porsche and one for the Camaro... oh well I guess they're all not "ultimate"!