無晝無暗 [无昼无－]

Jyutping mou4 zau3 mou4 ngam3
Pinyin wú zhòu wú àn

Definitions (Wiktionary)
  1. phrase, Hakka, idiomatic
    day and night; round the clock
    (syn.) 日以繼夜, 夜以繼日, 日以继夜, 夜以继日, 暝甲日, 暝拍日