Most Japanese only take one week of summer holidays.
The average Japanese person only takes about a week of holidays in the summer.
ーMost Japanese only take one week of summer holidays.
「ほとんどの日本人は夏休みを１週間しかとらない」
to take one week of summer holidays で「夏休みを１週間取る」
ーThe average Japanese person only takes about a week of holidays in the summer.
「普通の日本人は夏に約１週間の休みしか取らない」
average で「並の・普通の」
to take about a week of holidays in the summer で「夏に約１週間の休みを取る」
ご参考まで！
カナダ 
