
It should take you about 2 hours from Chester if you drive, or you could go on the train - there is a station right by the NEC. The NEC is well signposted off the M6 from B'ham.
Coming home, it'll probably take you about 2 hrs to get out of the car park :D
If you do go by car - don't forget to note which car park you're in - it's a lot of acres to search for your car if you forget (voice of experience speaking!!!)