It will take about an hour to get there.
到那里大约需要一小时。
I should imagine it will take about three hours.
我想得用差不多三个小时吧。
It'll take about three weeks, give or take a day or so.
这要花大约三周时间，出入不过一天左右。
The journey was reckoned to take about two hours.
路上估计要花大约两个小时。
It will take about an hour to get there, allowing for traffic delays.
考虑到交通阻塞，到那里大约需要一小时。