1, if you just learn excel, it will be quick. If you accept instructions quickly enough and really have basic computer knowledge, you can finish it in 3-5 days. If you can't learn even the most basic typing, it will take 1 -2 weeks, depending on the individual.

2, the office is simple, you can learn some online video tutorials and learn them soon. You can use it at any time in your daily office, remember more and ask more questions.

Yantai should have training in this field. You can search online.

The above information is only personal opinion, I hope it can help you!