time-consuming
adjective /ˈtaɪm kənsjuːmɪŋ/
  /ˈtaɪm kənsuːmɪŋ/
- taking or needing a lot of time- a difficult and time-consuming process
- It’s quite time-consuming having to check all the labels individually.
 Oxford Collocations DictionaryTime-consuming is used with these nouns:- process
- task