How long does it take for the invention patent to enter the substantive examination stage?

You need to disclose your patent specification before you can find it, provided that you make a request for disclosure in advance, which usually takes 8- 10 months. After the substantive examination fee is paid, it basically enters the substantive examination stage. It doesn't matter when he enters as long as he submits the substantive examination request and pays the money. What matters is when the test results are published, which usually takes at least 1 year.