Li lei began to work in a company at the age of 30,before long,he became a manager of the company.

问题描述:

Li lei began to work in a company at the age of 30,before long,he became a manager of the company.
before long 可否替换成in a few years

没那么长,大概就in a few months.
before long 的意思是“没过多久”