A standard tourist visa is only valid for one entry and for one month. You also need to tell us what date you want to cross Torugart. This is important because It will appear on the permission. You will be met by the Chinese company at the border. They have to know when you are arriving.
Some people do it in one day.
There are stories in various books etc. Just in case, we will give you documents to show that we have arranged transport, as well as contact names, telephone numbers and addresses in both Urumqi and Kashgar. If you go in our vehicle, our drivers will not leave you at the border until you have transferred to the Chinese vehicle which is meeting you. However, you must not mention Torugart in your application unless you already have permission to cross and can show it, or you will definitely be refused a visa. The Embassy in Bishkek or Alma Aty will just flatly deny that it is possible to get a visa.