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helelizwil
Yes - most absurdly . sometimes you wander whether its good idea to talk to your instructor - cos you will see he had charged you even for the time he was cracking jokes about some random thing.
and plus you will be in an quite awkward place to question the guy why he billed you for that amount , cos he would just come up and say something to cover it up.
Just go and ask the guys first who's the best and you have the right to ask for the instructor of your choice - since you are the customer & they should provide what you pay for.