Once you open the box and put the EMO on the board, how long until you take him off the board and let him explore the environment?
I would probably wait till the battery is fully charged. You can see its status in the app or you can ask EMO. The first method is more convenient.
Ask Emo "check your battery” he will show you, if it’s green then that’s when you know he’s fully charged.
Just in case you want to see how it works. Here is a video.