I applied for Intern position in Microsoft. First they would do an on-campus interview in your university. If you can pass that, you will come to the final-round interview, which is on-site. Microsoft would compensate your travel, food, hotel, etc. fee. The final-round would last 4 hours since it consists of 4 smaller interviews, usually 3 engineers and 1 team manager. And in a few days they will give you feedback.