It will take about an hour to get there.

　　到那里大約需要一小時。

　　I should imagine it will take about three hours.

　　我想得用差不多三個小時吧。

　　It'll take about three weeks, give or take a day or so.

　　這要花大約三周時間，出入不過一天左右。

　　The journey was reckoned to take about two hours.

　　路上估計(jì)要花大約兩個小時。

　　It will take about an hour to get there, allowing for traffic delays.

　　考慮到交通阻塞，到那里大約需要一小時。