would like to know where in kuwait i have to apply and how long do i get it?

You should apply from the consular department of Chinese embassy in your country. It is located at No.82, Street 1, Block 4, Yarmouk. Usually, it takes four working days to deal with your application.

It depends on your visit. If you need to visit China several times, then you should apply for a multiple entry one. If you just intend to have a single trip, a single entry L type is ok.