How long should I expect to be at Cog Hill in Lemont, IL next Wednesday for the (golf) Pro-Am?

I've decided to attend the Wednesday practice round/47th Annual Chick Evans Memorial Pro-Am at Cog Hill Golf & Country Club in Lemont, IL to maximize my chances of seeing my favorite players - Sergio Garcia, Fredrik Jacobson and Tiger Woods, among others (if they make it there, of course). What time should I arrive and how long should I expect to stay if my goal is mostly just to fanboy for a little while? I am wondering if I should plan to use a full vacation day for this.