I need help with hatching eggs!

I put in about dozen eggs in my incubator on the 11th of this month, today someone brought me another dozen eggs and they ask me if I can put them in my incubator as well because I have the room, I agree and I put them in there and I'm wanting to know if I need to set something else up for the eggs I already had in there for lockdown, or if since they were put in there so close together if they can all go on lockdown at the same time? Some were put in there at the 11th and some were put in today which is the 13th