There are several rounds of interviews, usually starting with a phone call with a recruiter. In some cases, typically with out-of-state candidates, an entire day can be filled with back-to-back interviews. For creative roles, there is always a test project and then, later, an opportunity to present your work to a group. Blizzard is known to take a while with its hiring process, unless it is an incredibly crucial role. Expect to wait a minimum of 1-2 months. The maximum wait time that I have heard of was 8 months.