everyday occurrence
深夜の残業は日常茶飯事だ。
Working late into the night is an everyday occurrence.
この地域では停電が日常茶飯事になっている。
In this region, power outages have become an everyday occurrence.
出張が多い父にとって夜行列車は日常茶飯事に過ぎなかった。
For a father who traveled constantly, overnight trains were nothing out of the ordinary.