Very fast process for me, but have heard that it went slow for some others. So varies.
Got a phone screen with some technical questions, then an onsite within a few days, and an offer a few days after that.
The interviews were good, lots of whiteboard coding questions but good questions, nothing stupid. Some basic sanity checks, i.e. very simple questions, some slightly more complicated (e.g. rearranging linked lists). Long day.
If one or two interviewers give a solid thumbs down they often stop the process so they do not waste time, so if the interview is shorter than expected then expect bad news. If you make it to see the hiring manager it is a good sign.