About one hour and 30 minutes.
大约一个半小时。
To stay fit, try to exercise for about 30 minutes every day.
为了保持健康，试着每天锻炼30分钟。
Put them into the pot with some sugar before simmering for another 30 minutes.
加糖后放入锅中再炖30分钟。
I walked and walked along the street, and about 30 minutes later, I found myself at the school gate.
我在街上走啊走，大约半小时后我发现自己来到了学校大门口。
The plane will land in 30 minutes.
飞机将在30分钟后降落在陆地上。
