Games and non-championship games have around the same time. Which is around 15-20 minutes. NBA halftime shows aren't really timed, it's live, and some halftime shows may be longer than others.
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Games are played in four quarters of 10 (international) or 12 minutes (NBA). Fifteen minutes are allowed for a half-time break, and two minutes are allowed at the other breaks. Overtime periods are five minutes long. Teams exchange baskets for the second half. The time allowed is actual playing time; the clock is stopped while the play is not active. Therefore, games generally take much longer to complete than the allotted game time, typically about two hours.