他走路去学校通常花费20分钟用英语怎么说

花费时间干某事只能用it takes somebody sometime to do some thing 的固定句型，
It usually takes him 20 minutes to walk to school.

It usually spend twenty minutes go to school

Usually,it takes him 20 minutes to walk to school.

It usually takes him twenty minutes to walk to school.
or
It usually takes him twenty minutes to go to school on foot.
or
He usually spends twenty minutes to go to school on foot.
or
He usually spends twenty minutes to walk to school.

he usually spend 20 minutes to go to school . .
用spend

he usually spend 20 minutes to go to school