How can a 9 year old make 800 in 2 hours?

A 9-year-old could potentially make $800 in 2 hours by engaging in a highly lucrative activity, such as hosting a successful lemonade stand at a major event or selling a popular item, like handmade crafts, if there's significant demand. They might also consider leveraging a skill, like performing in a talent show or offering a unique service, but such earnings are highly unlikely and would typically require adult assistance, sponsorship, or a very fortunate circumstance.