Apparently, its size is 6 MB.
In this video above, you can watch a tour of what seems to be a WIP of a custom spaceship-looking VRChat world in the Unity viewport shared by 3D Artist known as akimin with a caption saying it was made in Blender with a single 6 MB texture.
Have a look at some other akimin's VRChat worlds below, which can be purchased via the artist's Booth:
If you're interested in VRChat content, check out these fantastic 3D feathery wings created by Kaibatu for one of their VRChat avatars in Unity. These can also be purchased on Kaibatu's page on the Booth marketplace.
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