I applied in-person. The process took 1 day. I interviewed at Air Products (Allentown, PA) in July 2014
Interview
The process is an entire day. You have 4 separate 30 minute interviews, then lunch with current CDPs, then an hour to solve a problem individually, then an hour to talk about the solution with other applicants.
Interview questions [1]
Question 1
How have you overcome engineering challenges at school or work?