Afull stretching session should take between
a. five and ten minutes
b. half an hour to an hour
c. one and two hours
d. ten and twenty minutes

Usually ten to twenty mins.. it will depend on how deep you want to stretch and for what reason. It usually takes that long in gymnastics as we need to stretch out every muscle to prevent injury and to improve flexibility!

D - ten to twenty minutes

gives enough time to warm up/cool down your muscles

Can you list the drugs that you want answered for? i think maybe your answer could be a or b. but i’ll never know till you post the rest of this question.