Why does it take so long to get to work on time?

Why does it take so long, half an hour to arrive on time? Punctuality is no problem. He can let people see clearly and let people know that they can notify on time every hour. Because the weather is constantly changing, it is impossible to master it all the time. Even if you have the time to send it, punctuality will be different. First of all, after you have mastered the whole weather information, you must send out the content and accurate location, depending on the time and time, so I think it is impossible to report it at any time.