Took multiple months as I was not available. The recruiter did an excellent job in making sure that I take the interview. The interview took 45 mins and started with details about my previous work experience. That took about 20 mins and then I was left with 20 mins for the programming question. He gave me a problem related to BST. Obviously I need to draw the tree etc and he cannot see that on phone interview. I started with multiple approaches and he told specifically what I need to do eg. give only recursive solution, you can only store few things no extra space. In the end i was able to solve with a minor hint and he was also telling me to fix bugs as I was coding as well indent code as per his standards. Overall it was a good experience but I did not get the offer as they are looking for people who can code in like 10 mins as I was able to code in 15-20 mins. They want bug free code and will only go forward with the best candidate. I think even if you do a minor mistake you are out as there is someone else who will solve it perfectly so try to solve it perfectly :) Another important lesson is if you get option of phone v/s in person interview, I will say go for in person interview as it gives the interviewer the chance to see what you are doing on paper verses imagining that over phone.