They schedule you to come in for a 2.5 hour block of interviews, four interviews. The first and last interviews aren't technical, rather with managers, the first giving you a really good description of the job. The middle two interviews are more technical in nature, but more along the lines of "describe some projects you've done" rather than "write code on this whiteboard". The last interview is with a manager, more of a "get to know you" kind of talk. All told, the process is relatively painless.