How long should a normal pee take?

It depends on volume. Larger volume of voids would naturally take longer time to pass. Another factor would be the diameter of the urethra. If urine takes too long to pass compared to your previous normal you may need to see urology to eval for prostate enlargement or urethral stricture. Both would make diameter of urethra small and prolong voids. If so, needs treated before kidney disease or failure takes place.
The short answer is 'a short time'; usually under 10-15 seconds depending upon how much urine you need to eliminate, and depending upon one's gender. Fluid intake, kidney (renal) disease, prostate issues, etc. Can lengthen this time and even cause an obstruction so if there is any alteration of what is "normal" for you then ask your health care provider.