✔ 最佳答案
I will suggest you to apply your visa before you quit the job (which will make your application easier).
B1/B2 Travel Visa (if issued) is a 10-year multi-entry travel visa. It will allow you to stay in the United States for up to 6 months.
The application instruction can be referred to here:
http://chinese.hongkong.usconsulate.gov/niv_apply.html
I will say to to have more budget to show before you apply. With a amount of HKD$40,000 (air fare has deducted), I will not say you have a good chance. But if you quit your job with this budget, it will be a no for the visa.