how long after painting would you

let your LO sleep in their room? I painted a floor to ceiling tree on one of the walls in DS' room with chalkboard paint yesterday. He slept in our room last night and this morning I put one final coat on part of it just to cover up some spots that were a bit thin. Probably around 9 am. He did not nap in there and we've had a window fan on exhaust all day. Would you let the LO sleep in there tonight? The room doesn't smell of paint at all BUT his bed goes on the wall that was painted.