Ancient Roman pottery
... that the largest kilns for Ancient Roman pottery fired up to 40,000 pieces at a time?
... that the largest <a href="./Kiln" id="mwGg4" rel="mw:WikiLink" title="Kiln">kilns</a> for <b id="mwGg8"><a href="./Ancient_Roman_pottery" id="mwGhA" rel="mw:WikiLink" title="Ancient Roman pottery">Ancient Roman pottery</a></b> <i id="mwGhE">(example pictured)</i> fired up to 40,000 pieces at a time?