Take how long it requires to complete one pass, and multiply it by 32, it will be very close to that. It depends more on the quantity of RAM then the speed of the system for how long it will take.
The longest any of my computers have taken to complete one pass on the standard test is a bit over one hour... Some computers that I have run it on, like the dells and HPs that never have enough memory can do a single pass in less then 30 minutes. Did you turn on ALL the tests? A few of the non standard tests can take hours.