YOU SAID:
I need to waste 10 minutes
INTO JAPANESE
10分無駄にします
BACK INTO ENGLISH
Waste 10 minutes
INTO JAPANESE
10分無駄にする
BACK INTO ENGLISH
Wasted 10 minutes
INTO JAPANESE
無駄な10分
BACK INTO ENGLISH
Wasted 10 minutes
Come on, you can do better than that.