How much time does pledging take up?

Hey,
I just finished my freshmen year in college. And, I want to rush a fraternity in fall 2016 (my sophomore year). The only concern I have is time. In my next semester I am taking 16 credit hours and I am also working on some project that will take up 5-6 hours per week.
So, can you tell me how much time did pledging will take up. What are the things you do while pledging?

Thank you