楼上理解有误,因为ride可以做名词的。
The bus ride usually takes about half an hour.
= It usually takes about half an hour to take the bus.
= Taking the bus usually takes about half an hour.
另:half an hour可以换写成thirty minutes;
about可以换写成around/approximately;
或者也可以把about换写成or so,不过or so必须放到half an hour之后。
参考资料:英语牛人团