If it is a computer office software course, it will take about a week. There are also graphic design courses, such as PS, which is about 1 month, and there are also crash courses. And programming, such as JAVA development, takes about 6 months. Office, a series of simple office software, can learn this in three days at most as long as you can use the computer, and you will be familiar with the most basic operation in three weeks if you can't use the computer.
It depends on what kind of knowledge you want to learn. If it is basic applied knowledge and skills, 1-2 weeks is enough. If it is operation and maintenance or network management, it will take 1 to several months. Programming development time is longer, at least more than one year. All of the above are systematic learning. Generally, short-term computer training lasts 4-6 months, but everyone's specific situation is different and the suitable courses are different. It is recommended to attend the course in person to understand the specific situation.