A person who is good at using time must be a person who pays attention to the granularity of time. So what is time granularity?
To put it simply, the so-called time granularity is the most basic unit for a person to manage time.
Some people have a half-day granularity of time, such as retired elderly people because his time is relatively free. Some people's time granularity is 15 minutes, such as Wang Jianlin, whose itinerary is the basic time granularity for meeting with provincial leaders. Some short meetings and even handshakes, autographs, and photos are counted in seconds. Some people have a time granularity of five minutes, such as Bilgai.
Caltrop. 
Most people have a few reasons for the greater granularity of their time:
1.Lack of purpose and compulsion:
Without clear goals and plans, time management is not refined enough, and for these people, even if they are planned, they feel that they can do or not do some things. For example, if you plan to memorize ten words today, you may casually go and see what no one will do to you even if you plan and don't do it. Over time, your time granularity will only get bigger.
2.Xi habitual procrastination:
They can't step out of their comfort zone, they think they'll do it anyway, wait a minute, ten minutes, twenty minutes, and before you know it, the granularity of your time is gradually increasing.
3.External interference:
There are many external distractions in modern society, such as the attraction brought by mobile phones, and now that the network is developed, you can get in touch with your own areas of interest through mobile phones, and the vast majority of people are easy to distract people, resulting in increased time granularity.
4.The awareness of time is not deep enough:
Do not understand the importance of time, it is difficult to form a respect for time, which leads to a large granularity of time, time is the fairest resource in the world, everyone's day is only 24 hours, your day is devoted, will determine how high you stand in the future.
No matter how granular your time is, it is very necessary to respect the granularity of others' time, otherwise it is easy for others to lose their impression of you.
If your time granularity is 60 minutes, and someone else's time granularity is 15 minutes, if you are 15 minutes late, it means that someone else has already entered the next time granularity of the work schedule, and he may not be waiting for you. Wang Jianlin's itinerary is very detailed, once a CCTV reporter made an appointment to interview him, but accidentally arrived 3 minutes late, and finally Wang Jianlin got in the car and left. Such a strict concept of time, perhaps ordinary people can't understand it, thinking that he is playing a big name. You think, for him, 15 minutes is already the scale standard for him to handle many important matters, and what 3 minutes means to him is something that ordinary people can't feel.
Wang Jianlin Therefore, to measure whether a person is professional in the business world, abiding by time is one of the most basic requirements, because abiding by time is to understand and respect the granularity of others' time.