Hello,<br/><br/>I understand below example's mean. However, I don't understand usage of "as long".<br/><br/>is there the way as noun in long? Please help me.<br/><br/>example:<br/><br/>If you gp by train, you have to change trains, so it is inconvenient. If you go by bus, it takes only two-thirds as long.<br/><br/>Thanks.