Hi, Can M Visa be extend from 30 days to 60 day and how to apply? thanks much

Usually, the extended period won’t exceed the duration of stay of your current M type, but you can give it a try. You should first prepare your passport, valid registration form of temporary residence, the application form, a passport-style photo, and an invitation letter from your business partner, as well as the return ticket. And then submit the application to the exit and entry administration of the local PSB to apply for the extension.