Even if they include junior high it would only be 6 years not 7 years.

It's just a funny line! They may have got the idea from Animal House, when Bluto says" 7 years of college down the drain!"

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Nailed it!
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"Whoosh!"

Very clearly a joke. Maybe they should have displayed the word "JOKE" at the bottom of the screen for that certain demographic out there.
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Most certainly a being held back joke. Although one could assume they are including junior high and not technically be wrong, I suppose.

I was under the impression that it might have been a high school that maybe had grades 7 and 8, or even 6 as well.
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well theres four years of highschoolfive if you returnits quite obvious that the Butabi bros must have been held back atleast 2 years because of there obvious stupidity ahah.
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they weren't. It was a joke. "All 7 years of high school" means he was held back three times. It's a common joke, too.

i know how many years r in high school
but i didnt know if they were including junior high also

They obviously got held back in high school for those extra years. High school in the United States is generally four years, grades 9-12.

Being Greek, I might just be talking beep right now, but isn't high school supposed to last 3 years?
Well he probably meant that it took them (much) longer to finish it, bright as they were!
It's a typical school joke, I've even seen it in a Greek comedy from the 60's