Two feet, 58 issues of Isaac Asimov's SF mag. It was just before high school ended and a bookstore had a box stuffed with these on their stoop, free for grabs. I took the whole box. They span from 1978 to 1993, with the bulk of complete years being 1981 and 1984.
I've been separated from most of them for about a decade. I can't find ASF anywhere in shops nowadays, so I think they'll get their very own shelf, as I do not expect their ranks to grow.