Yep, if they ask you for how many times and you :" just 20 minutes" *LOL* But it's true that my teacher was so shocked by the 20 minutes that he didn't say anything at the moment but he's still telling him to all the students as "don't frak with me again guys ! I don't wanna her your sexual stories " *GGG*

he was very great, I think it was the best English teacher I never had ;)