How long is tourist visa for China valid after issue?How long to process application?

I am a Canadian citizen visiting China as a tourist from June 15, 2018 , departing July 2, 2018. When should I apply for my entry permit? How long is visa valid after it is issued?
What is the usual time period required to process a tourist L application if I personally deliver the application and related documents to CVASC in Vancouver, BC? What is the cost for a single entry tourist L?
Thanks for your help,
Steve Struthers