My stupid dr told me to do the 2hr test as it was more accurate, so i went off to have it they took the 1st lot of blood and i drank the green drink within 5mins, and as i was coming up to the 1st hr i was violently ill and they had to stop the test i felt terrible afterwards luckily DP went with me soo i could go straight home and have a shower and lay down. So then i tried the hour test and it was clear like lemonade and i got through that fine no worries, i even stayed the hour in the waiting room incase i was sick again.