It took one full day for the entire process to get over. It was good so that I didn't have to go back and then come again. There were 4 rounds followed by an HR discussion at the end. The first round started with a thorough technical stuff which was more of a discussion on given problem and both the interviewer and I were able to devise a amicable solution with the interviewer probing at the specifics of the solution or logic offered. Next rounds were more managerial with the India head taking the last of them.