sup Blueberry!.....
i would say mine are 4" max.... and yeah i've read that from 2 weeks these start to show signs of flower (white hairs) ... but most threads i've read have had people saying "day 36 and just showing white hairs" so as i'm using cfl's i'm not expecting super rapid... but i guess failure and success must come down to more factors then choice or intensity of light alone
... think mine are starting to show something between 2nd...and 3rd node, went in for a closer inspection and after whacking my head on the reflector and generally arseing around i found i still couldn't see close enough lol so could be?? or could be another tiny leaf set forming hehehe
after tissue germ'ing 3 days... i put them in 3" pots with very light seeding soil and (i crushed some purlite up and added it, soil 80% purlite 20%).... but i have bought a bag of light mix from the hydro shop (lightly fert'd i'm guessing) for my final 60%/40% mix ... so in short no its a different soil mix this time.
yeah sixteen ... pretty much what i did with mine
... nice one fella