Wouldn't it make more sense to work more the years where his hourly wage is the highest? The years where he reaches his goal in May is the years he should work

Wouldn't it make more sense to work more the years where his hourly wage is the highest? The years where he reaches his goal in May is the years he should work longer. I remember reading a story about how NYC taxi drivers worked until they made a 100$ before going home. This lead them to working longer on days with lots of competition and less demand, and shorter days on days with less competition and more demand.