Each commercial lasted 10 minutes, so three commercials lasted 3 * 10 = <<10*3=30>>30 minutes.
The show was aired for 1.5 hours, and 30 minutes is 0.5 of an hour, so without the commercials, the show was 1.5 - 0.5 = <<1.5-0.5=1>>1 hour long.
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