The mission is part of week 9 of the second chapter of the game, in which you will have to perform and complete a time trial driving a motorboat. But developers have not been more specific than this and it is necessary to find the time trial on the map.
The time trial is on the lake, next to the Slurpy Swamp Dam, near the grasslands of Misty Meadows. As you go down you will see the boats on the lake, but the starting point is along the southern shore.
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