Processing flow:
1) It takes two working days to go through the employment registration formalities, but actually one working day is enough, and the certificate only has the ID number.
2) According to the second brother's working days, you can check whether the employment filing is successful on the third day. If the audit is successful, you can go through the social security transfer procedures, which is also two working days. In fact, one day is enough.
3) So, if you are fully prepared, five days at most.
4) Of course, if an accident happens, it will take a long time.
5) In other provinces and cities, you can also apply online, which takes about the same time.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.