Going off of [url=https://i.kinja-img.com/gawker-media/image/upload/t_original/1525827739002522401.jpg]this image[/url] from [url=https://www.kotaku.com.au/2015/11/eve-online-ships-compared-to-the-real-world] this article[/url], about 2km.

That took some digging; most size comparison charts don't acknowledge ORE ships' existence.