The amount of something that is expected to last for or be produced in one year.
1967,Water and Water Engineering:
We've given a million pounds to these waterworks and we shan't live to use more than (say) fifteenyearsworth of them.
1994, Bradford Morrow,Conjunctions, Random House Inc,→ISBN:
So she writes tenyearsworth of practice-fiction without making noteworthy progress except in language-mechanics and the range of her vocabulary, meanwhile accumulating mileage on her experiential odometer
1997, John Barth,The Tidewater Tales, Taylor & Francis,→ISBN, page313:
He didn't look like my father or my brother, Kath; he was my clone, only older. He didn't look like what I look like now, seventeenyearsworth of stories later; he looked like what I'll look like another twenty-someyearsworth of stories from now
