How many people do you think will NOT return to this one cl im taking in college?

the is History 143, which is about the 1400s-1800s. yea pretty boring, and the teacher looks like the skinny version of santa claus, hes sooooo boring the cl is 3 hours long from 7pm-10:10pm, but its only on wednesdays, last week was the first day of the cl and it was full 30+ students, the teacher did a 2 and half hour lecture about galileo galilae, i would look around and everybody looked dead, my question is how many people do you think will drop the cl?, i say 10+.