How long will this dirtbike last(in gas usage) for my 12 year old nephew

So I got my 12 year old nephew a somewhat cheap dirtbike, 400 dollars. He's 12 years old, 5 feet tall. 50cc 2 stroke. It holds 0.45 Gallons of gas, wondering how long it would last if he constantly used it with no stop until it ran out.(IT GOES 24.9 MPH, ATLEAST IS SAYS IT DOES.)
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I think it will completely be up to how it is ridden.
If it was ridden at WOT, you could probably kill a half gallon in 30 minutes.
A kid learning might get a couple hours of ride time from that tank.
-BIG DAN:thumb: