With Pāyāsi 11.2

11.2

Yaṃ kho pana, rājañña, mānussakaṃ vassasataṃ, devānaṃ tāvatiṃsānaṃ eso eko rattindivo, tāya rattiyā tiṃsarattiyo māso, tena māsena dvādasamāsiyo saṃvaccharo, tena saṃvaccharena dibbaṃ vassasahassaṃ devānaṃ tāvatiṃsānaṃ āyuppamāṇaṃ.

A hundred human years are equivalent to one day and night for the gods of the thirty-three. Thirty such days make a month, and twelve months make a year. The gods of the thirty-three have a lifespan of a thousand such years.