俱舍論記 12.18

12.18

「所餘成壞至二十中劫」者，因明住劫，復顯成、壞、空三時皆准住劫。

"The remaining [kalpas] of formation and destruction... up to: twenty intermediate kalpas": By way of explaining the kalpa of duration, it further reveals that the three periods of formation, destruction, and emptiness all conform to the kalpa of duration.