5 games max per team. This is a rule from the RFU to limit playing time from a player welfare point of view. U10 players can play a maximum of 60 minutes per day.
8-a-side. Max. squad sizes = 12. Festival match duration: 6 minutes per half. Pitch size: 35m x 60m. See: https://ealingrugby.co.uk/wp-content/uploads/2017/11/Ealing-Minis-Festival-2017-Information-Pack-18-19-Nov17.pdf
Under 10