Sorry, but if 'tuition' means 'class', it is so in only some Englishes. In AmE, 'tuition' means money paid for attending school. A - John, until/till what time will you be free?
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Mr. TomWe very often use the phrase "By what time" in our neck of the woods.By what time will he be back?By what time will the car be ready?How did this phrase sound to your native ears? Redundant? Wrong?You don't need "by" in either of these questions, but they are not wrong with "by," nor would they be wrong with "at."