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The original rules of Basketball, developed by James Naismith in 1891, stated that the game should be divided into two 15-minute halves, with 5 minutes rest in between.
This means that following the original rules, the game lasted 30 minutes (or 35 minutes including the break).
Modern day games are comprised of four 10-minute quarters (FIBA), or four 12-minute quarters (NBA). With 5-minute overtime periods.
When Dr. James Niasmith invented basketball, one of his published rules was that each game would consist of two 15-minute halves, and a halftime lasting 5 minutes.