Tricky question mate. Personally i dont think theys a definite answer for you, just do a bit of looking around the site at autos in the 2 week stage. If it looks to good to be true, it probably is, so if they look amazing and yours look like a sprout, dont worry, they aint alway true, however, look at the growera who specialises in autos and go from the photos they have at 2-3weeks.
Autos are crazy man, my rule of thumb is give them time, if you have the space that is , but yeah look around the site at "pro" auto growers mate and get a bettwr idea from those guys.
Ive had them 1 inch after 2 weeks and ive also had the 6 inch after 2-3 weeks.
Hope this gives you a better idea mate