VAR themselves do not hurt VAM, or unpacked either. The type of content does. Lots of morphs, lots of "listable" assets (hairs, clothings etc) do.
Giving you a number would be arbitrary, just maintain and keep your VAM clean of content you don't use.
But if you really want a number, having a VAM that is 3 times the size of the biggest games on the market might already slow down your experience ( so around 110 to 150gigs x 3 > around 500gigs )... IF they are all morphs/hairs/clothings. If you had 500gigs of assetbundles (custom unity assets) it would matter that much.