"Lockdown" is not a term in my vocabulary. I candle at 7 and 14 days. At 18 I put them in the hatcher and I come and go as I please if humidity is to low. I also remove chicks as they fluff so I can make room for the others. I haven't lost a chick yet. Don't worry if you have them out for a few minutes here and there. What do you think a hen is doing for 21 days? She gets up and moves around too.