If you are applying for credit cards from the same bank, the answer is N, there is no limit.

If it is from different banks, generally speaking, after you hold credit cards from more than 5 issuing banks, it is very likely that your application for a credit card from another bank will be rejected, and there are exceptions.

Generally, a credit card must be valid for 6 months, and it is recommended to be more than 8 months. If you apply for a credit card from another bank, as long as you have no bad credit record, the success rate is very high.