The process took 1+ week. I interviewed at PerkinElmer
Interview
direct reference, call, personal interview, final selection (if your boss consider you as a poor guy with no brains), HR will send offer letter and you can join very next day.
Really easy and hr manager was kind and proactive.
By the end the entire process was simple and relaxing.
The last step with the general manager was the same, I can say that in Perkin Elmer we are a family.
It was well managed interview process, it began with a brief HR interview and two technical rounds. the time consumed in decision making was more than 2 months. But at the end it was worth waiting.