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How often does a leap year occur in the 19-year Jewish calendar cycle?

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Circular diagram of the Jewish religious year showing Hebrew months around the outer ring and Gregorian months inside, with major holidays and fasts such as Rosh Hashanah, Yom Kippur, Sukkot, Hanukkah, Passover, and Purim labeled with their dates. — Jewish religious year The months and holidays of the Jewish religious year.

In the 19-year Jewish calendar cycle, also known as the Metonic cycle, a leap year occurs seven times.12

To ensure that major festivals remain in their proper seasons, a 13th month of 30 days is intercalated during the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years of this cycle. This additional month, known as First Adar, is added to align the lunar months with the solar year.12