There is no definite size, as anything on this scale and distance is liable to change and distortion.
However, it has generally been estimated that the Virgo Supercluster is at least 110 million light years across.
For comparison our Galaxy is only 100,000 light years across and the Sun is only 8 light minutes from us.
See related link for more information.
The Local group for the clusterThe Virgo Super Clusters for the Supercluster
The Virgo Supercluster, often just called the Local Supercluster
The Earth is located within a supercluster called the Laniakea Supercluster. It is a vast system of galaxies that includes our Milky Way galaxy and thousands of others, bound together by gravity. The Laniakea Supercluster was defined in 2014 by astronomers studying the motions of galaxies in the universe.
The Milky Way is part of the Virgo Supercluster.
Every single type.
Our local cluster is known as - well "The Local Cluster", Not very imaginative I know. It is part of the the Virgo Supercluster or Local Supercluster.
The Virgo Supercluster contains over 100 galaxy groups and clusters, including the well-known Virgo Cluster. Estimates suggest that it harbors approximately 2,000 galaxies, although some sources propose that the total could be higher, potentially encompassing up to 3,000 galaxies when accounting for smaller groups and isolated galaxies. This supercluster is part of the larger Laniakea Supercluster, which includes our Milky Way galaxy.
The Virgo Supercluster (in which the Milky Way is located) is about 200 million light years across.
Until now, the Milky Way was believed to be one galaxy in the 2,000 that make up what's known as the Virgo "supercluster".
the Virgo cluster of galaxies is about 60 million light years away from the Sun.
The Solar System contains the Earth-Moon system. The Milky Way galaxy contains the Solar System. The Virgo supercluster contains the Milky Way galaxy. The Universe contains the Virgo supercluster.
The Milky Way is part of the Local Group, which is part of the Virgo Supercluster.