Abhidhamma Pitaka
Described in the Vibhanga division of the Abhidhamma Pitaka are sixteen "rupa brahma lokas" (worlds or planes) and four higher "arupa brahma lokas", each attained through the imperfect, medial or perfect performance of the four states of "jhana" (meditation), granting a duration of life measured in "kalpas" that exceed the top-most heavenly "loka" of 9.216 billion years: