How many minutes are in an NBA quarter?

I’m trying to understand the game structure in National Basketball Association basketball. How long is each quarter, and does this differ from other levels like college or international play? Also, how does quarter length impact the overall game duration?
 
In the National Basketball Association, each quarter runs for 12 minutes. With four quarters in a game, that adds up to 48 minutes of regulation play. This is actually longer than the quarters (or halves) used in college basketball, which follow different timing rules.
 
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