Day in and Day out

We use the phrase day in and day out to describe a lengthy process that we would do over a period of time. It's more of an expressive phrase to describe how hard we work. When we say this phrase to someone, the person listening to us should somehow feel sympathy and remorse for our hard strenuous work.

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Let's look at a quick example.

I trained day in and day out to become the next great boxer like Klitschko. Even though I know taking a few too many hits will cause brain damage, it's worth the money in the end run.

I think everyone who watches boxing, knows who Klitscho is. The man could be in the Ukrainian version of Rocky. It would have been funny to see KLITSCHKO VS DOLPH LUNDGREN. I used the phrasal verb 'end run' in the sentence which means in the end... Well, what will be in the end. There is no 'RUN' about it.

I take punches day in and day out.. Now I'm mayor Klitschko