I applied online. The process took 1 week. I interviewed at Bloomberg (New York, NY) in Oct 2015
Interview
I was unfortunately chosen as an alternate in the interview process. However I didn't fully understand if I still had an opportunity to interview for the company or not until the schedule was finalized. They didn't really try to keep in contact through out the whole process and so I felt as if I wasn't a valuable candidate in the end.
Submitted an online application and got an telephone interview. Mostly competency questions but also some technical questions and some about the markets and news and so on. The interview lasted for about 30 minuters and I got an answer about a week after.
The process took 2 weeks. I interviewed at Bloomberg (New York, NY) in Mar 2010
Interview
Applied online, called to set up a phone interview. The interview lasted about 30 minutes and consisted mostly of personality fit questions along with questions about current events in the economy. Felt pretty good about it, got a call a week and a half later saying they were not hiring as many summer interns as they envisioned.