長撓撓 [长挠挠]

Jyutping coeng4 naau4 naau4
Pinyin zhǎng náo náo

Definitions (CC-CANTO)
  1. very long (time)
Definitions (粵典–words.hk)
  1. 副詞、舊式
    好​耐​之​後​；​好長​時間
    a long time