One phone interview and then a final onsite interview (in Boston office) if phone interview is qualified. They give their answer in about 2 - 3 days. The internship is 10 to 12 weeks long. You get to work on a project and do a presentation to the Liberty Mutual data science community at the end of the internship. If you do the presentation and project well and communicate thoroughly with peers and managers then they will give you a full time position starting next year if you are graduating or a return internship offer for next summer if you have a few more years in your PhD. program.