busy-work

/B IH1 Z IY0 W ER0 K/
noun
  1. 1

    Work or activity performed with the intention or result of occupying time, and not necessarily to accomplish something productive; routine work of low priority undertaken for the sake of avoiding idleness.

    Until we have a system clearly established, entering more data is just busy work.

Source: https://en.wiktionary.org/wiki/busy%20work, https://en.wiktionary.org/wiki/busy-work