also: じかんのムダ
expression, noun
A common phrase meaning that an activity or effort is not worth the time spent.
そんなことをしても時間の無駄だ。
Doing that is a waste of time.
会議が長すぎて時間の無駄だった。
The meeting was too long and a waste of time.
Compound of 時間 (time) + の (possessive particle) + 無駄 (waste, futility).