I applied through college or university. The process took 5 days. I interviewed at American Express (New York, NY) in Jan 2015
Interview
Superday at the company headquarters at NYC
Company tour & intro + 45min * 2 interviews
Mostly questions related to resume, what you've done in school, previous experiences & etc. The questions will get deeper into models and methodologies.
A couple of behavioral questions or industry related questions, usually not very difficult