lessons

-Undergraduates on average have 2 hours' lessons every day

1. 2 hour lessons every day

have lessons that last two hours every day

2. Okay

have to go to class for 2 hours every day

3. Says something different than the first two.

have to be in class for 2 hours every day.

4. Again, says something different.

How often do postgraduates have class?

5. Okay.

Thank you~

Could

-They have to go to class for 2 hours every day.

mean

-They have to fulfil the (strange) requirement of reaching the travelling time minimum of 2 hours. (=The act of going should last 2 hours, not the class)

I can't imagine a weird situation like that, WB.

Thank you~