Well, I put mine in the growing media from day 1. I started germinating a Barney's farm LSD and a Ceres Orange Bud 3 days ago. Both have already germinated and the BF LSD is about 1.75 inches tall and already starting it's 2nd set of leaves and the Orange bud is about .75 inches tall right now ( by morning she'll be 2+ inches tall!!!).
But, to answer your question, no they do not all advance at the same rate (it depends on strain, lighting, media, etc). How long does it take? that depends on a multitude of variables. It's impossible to predict without knowing strain/media/lighting/etc.. Just give 'em a few days and all should be good.