Around 10 hours when I was playing Golden Sun: The Lost Age. I remember it was right after I had just beaten Posiden who I struggled to beat for a very long time, so when I did finally beat him, I was just so excited exploring the second half of the world. Ahhhh good times good times.
It was either 14 hours of Pokemon in a car ride or 14 hours of Minish Cap in a car ride. Both were quite fun but I definitely crashed when we got to the place at something like 8 PM. Car rides are quite tiring since they can be super boring.