My guess... a week at the most.
Well the store said a week....I guess they just grow so fast that I feel like they have to be older. That means they will be about three weeks old next tuesday the 17th. They went outside in their tote for almost an hour today.....and from time to time I am going to start cutting the light off.....I am almost always in the same room as them so I will be able to keep an eye on them. I have to say that I enjoyed the broody doing all the work instead of me. :/ I will most likely not do this again. It has not been much trouble, but I feel bad for them. They have no mommy and they are under that light almost 24/7. It just seems so unnatural and I will probably not choose this route again. I wanted the experience so if I ever need to do it I will know what to do.
And now I have to make up my mind to cull some of my chickens from my two small winter hatches ....4 out of 5 are roosters and that gives me 6 roosters! It looks like I am going to have to do it myself....I think my husband is trying to weasel out on me, lol. I guess I need to check out that thread again to learn just how to do it.