labor-consuming
labour consuming BrE

"But that must be visually read and keyed in, and it's a manual and time-consuming, labor-consuming process."

Yet carving the plate was time and labour consuming.

Harperley held approximately 800 to 1500 PoW's, all Junior Ranks and Senior NCO's, and they were utilised extensively as manpower to work on agriculture, dam, forestry and many other local labour consuming projects.