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The spectrum of lengths for TV and video ads, with 15 and 30 seconds being the most common. Deep-pocketed advertisers may cut three different versions and use the 60-second one for national TV, the 30-second one for local TV, and the 15-second one for digital and social. Six-, seven- and 10-second spots are also commonplace for video ads on digital platforms, and in 2017, Fox brought six-second commercials to linear TV during N.F.L. games.