He works for Apple, so a little background reading would suggest that he was probably making a sarcastic reply to what he perceived to be a dumb question.
While my personal preference is to reserve judgment concerning the value of a given question, I can't really fault famous600 for taking a jab here and there. Most of this stuff has already been answered, many times. Nothing, and I'll repeat - NOTHING - has suggested that it's a 90 day temp sort of arrangement. Not even for those who hire in with Kelly. So the question was kinda begging for a sarcastic reply.
With respect to the specific conversation here, an individual stated that he/she was told that it might take up to two weeks, and then asked for a conclusion after four days. Res ipsa loquitur.
(I've said it a few times already, but → four weeks. I got an offer call four weeks after my background check came back clean.) Maybe they'll ******* me soon, simply because I'm not a very pleasant person and I don't really embrace the Apple culture, but there's nothing structural about the job that suggests that this will happen. As far as I know, I can continue to do my job and continue to be paid for doing so.