The text explains the different lifespans of the deities in the heavens: 500 heavenly years (9 million human years) for the deities in the Cātumahārājika Heaven; 1,000 heavenly years (36 million human years) for the deities in the Tāvatiṃsa Heaven; 2,000 heavenly years (77 million human years for) the deities in the Yāma Heaven; 3,000 heavenly years (576 million human years) for the deities in the Tusitā Heaven; etc.
Colophon:
Folio 7 on the verso side: Sitthipanya was the scribe. May I share the merit, please. The story of all the Buddhas.