I would have 30 minutes for playing (10+5) would be my reccomendation for time control, but kids do tend to play fast. for the first lesson, i would split into groups, kids who know how to play, and kids who don't. have the kids who know how to play, play some games, and the kids who don't you can teach the rules. After that I think your biggest problem is going to be managing if someone made a legal move or not tbh.
I've been playing chess for quite some time now, and so I decided to start a chess club for elementary-aged kids (grades K-5). I am going to assume many of these kids have not seen a chess board before, and maybe a couple could probably hold their own. I'm also getting my brother to help me run the club.
How should I teach these young total beginners? I have an hour session each time, planning to spend about half of it with lessons and half (or more) with just playing.
And what do I do with the other kids that claim to have played before? I don't want to force them to sit through a boring lesson on how the pieces move if they already know.
By the way, I am only a volunteer, so these kids and their parents arent giving me anything except their time. Also, I have access to a solid amount of chess boards and I own a demonstration board. Thanks in advance for your help!