Well, just to throw an alternate opinion out there, I do not shake nor do I rehydrate dry yeast.
The aeration process I use aerates the wort on it's way to the fermenter. By the time it is there, it is properly aerated. When the wort is in the fermenter I sprinkle my dry yeast on top. My fermentations always take off in <4 hours and a normal size beer will ferment completely in <4 days.
Just sayin.
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