I applied through a recruiter. The process took 4 weeks. I interviewed at Digitas (New York, NY) in Jun 2014
Interview
The process took about 4 weeks. Was recruited on LinkedIn, did a brief phone interview with HR, and then had a series of 4 in-person interviews. You are expected to answer questions about their current clients, explain how you would solve a problem, and and complete a market sizing question.
I applied online. The process took 3 weeks. I interviewed at Digitas (Boston, MA) in Jun 2013
Interview
Phone screen followed by in person with four 30 minute interviews. The majority of the interviews focused on experience and skills based questions while also receiving a pretty standard market sizing case question. Also discussed the potential role and had time to ask questions about the company and position. Definitely come prepared with questions to ask.